Class: Hash

Inherits:
Object show all
Includes:
Enumerable
Defined in:
opal/opal/corelib/hash.rb,
opal/opal/corelib/pattern_matching.rb,
opal/opal/corelib/marshal/write_buffer.rb

Overview


Internal properties:

  • $$map [JS::Object hash-bucket>] the hash table for ordinary keys
  • $$smap [JS::Object hash-bucket>] the hash table for string keys
  • $$keys [Array] the list of all keys
  • $$proc [Proc,null,nil] the default proc used for missing keys
  • hash-bucket [JS::Object] an element of a linked list that holds hash values, keys are {key:,key_hash:,value:,next:}

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#all?, #any?, #chunk, #chunk_while, #collect, #collect_concat, #count, #cycle, #detect, #drop, #drop_while, #each_cons, #each_entry, #each_slice, #each_with_index, #each_with_object, #entries, #enumerator_size, #filter_map, #find_all, #find_index, #first, #grep, #grep_v, #group_by, #inject, #lazy, #max, #max_by, #min, #min_by, #minmax, #minmax_by, #none?, #one?, #partition, #reverse_each, #slice_after, #slice_before, #slice_when, #sort, #sort_by, #sum, #take, #take_while, #tally, #uniq, #zip

Constructor Details

#initialize(defaults = undefined, &block) ⇒ Hash

Returns a new instance of Hash.


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# File 'opal/opal/corelib/hash.rb', line 83

def initialize(defaults = undefined, &block)
  %x{
    if (defaults !== undefined && block !== nil) {
      #{raise ArgumentError, 'wrong number of arguments (1 for 0)'}
    }
    self.$$none = (defaults === undefined ? nil : defaults);
    self.$$proc = block;

    return self;
  }
end

Class Method Details

.[](*argv) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 17

def self.[](*argv)
  %x{
    var hash, argc = argv.length, i;

    if (argc === 1) {
      hash = #{Opal.coerce_to?(argv[0], Hash, :to_hash)};
      if (hash !== nil) {
        return #{allocate.merge!(`hash`)};
      }

      argv = #{Opal.coerce_to?(argv[0], Array, :to_ary)};
      if (argv === nil) {
        #{raise ArgumentError, 'odd number of arguments for Hash'}
      }

      argc = argv.length;
      hash = #{allocate};

      for (i = 0; i < argc; i++) {
        if (!argv[i].$$is_array) continue;
        switch(argv[i].length) {
        case 1:
          hash.$store(argv[i][0], nil);
          break;
        case 2:
          hash.$store(argv[i][0], argv[i][1]);
          break;
        default:
          #{raise ArgumentError, "invalid number of elements (#{`argv[i].length`} for 1..2)"}
        }
      }

      return hash;
    }

    if (argc % 2 !== 0) {
      #{raise ArgumentError, 'odd number of arguments for Hash'}
    }

    hash = #{allocate};

    for (i = 0; i < argc; i += 2) {
      hash.$store(argv[i], argv[i + 1]);
    }

    return hash;
  }
end

.allocateObject


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# File 'opal/opal/corelib/hash.rb', line 66

def self.allocate
  %x{
    var hash = new self.$$constructor();

    Opal.hash_init(hash);

    hash.$$none = nil;
    hash.$$proc = nil;

    return hash;
  }
end

.try_convert(obj) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 79

def self.try_convert(obj)
  Opal.coerce_to?(obj, Hash, :to_hash)
end

Instance Method Details

#<(other) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 166

def <(other)
  other = Opal.coerce_to!(other, Hash, :to_hash)
  other > self
end

#<=(other) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 171

def <=(other)
  other = Opal.coerce_to!(other, Hash, :to_hash)
  other >= self
end

#==(other) ⇒ Object Also known as: eql?


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# File 'opal/opal/corelib/hash.rb', line 95

def ==(other)
  %x{
    if (self === other) {
      return true;
    }

    if (!other.$$is_hash) {
      return false;
    }

    if (self.$$keys.length !== other.$$keys.length) {
      return false;
    }

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, other_value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
        other_value = other.$$smap[key];
      } else {
        value = key.value;
        other_value = Opal.hash_get(other, key.key);
      }

      if (other_value === undefined || !value['$eql?'](other_value)) {
        return false;
      }
    }

    return true;
  }
end

#>(other) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 154

def >(other)
  other = Opal.coerce_to!(other, Hash, :to_hash)

  %x{
    if (self.$$keys.length <= other.$$keys.length) {
      return false
    }
  }

  self >= other
end

#>=(other) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 129

def >=(other)
  other = Opal.coerce_to!(other, Hash, :to_hash)

  %x{
    if (self.$$keys.length < other.$$keys.length) {
      return false
    }
  }

  result = true

  other.each do |other_key, other_val|
    val = fetch(other_key, `null`)

    %x{
      if (val == null || val !== other_val) {
        result = false;
        return;
      }
    }
  end

  result
end

#[](key) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 176

def [](key)
  %x{
    var value = Opal.hash_get(self, key);

    if (value !== undefined) {
      return value;
    }

    return self.$default(key);
  }
end

#[]=(key, value) ⇒ Object Also known as: store


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# File 'opal/opal/corelib/hash.rb', line 188

def []=(key, value)
  %x{
    Opal.hash_put(self, key, value);
    return value;
  }
end

#__marshal__(buffer) ⇒ Object


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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 61

def __marshal__(buffer)
  if default_proc
    raise TypeError, "can't dump hash with default proc"
  end

  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.write_user_class(Hash, self)
  if default
    buffer.append('}')
    buffer.write_hash(self)
    buffer.write(default)
  else
    buffer.append('{')
    buffer.write_hash(self)
  end
  buffer.write_ivars_suffix(self)
end

#assoc(object) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 195

def assoc(object)
  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        if (#{`key` == object}) {
          return [key, self.$$smap[key]];
        }
      } else {
        if (#{`key.key` == object}) {
          return [key.key, key.value];
        }
      }
    }

    return nil;
  }
end

#clearObject


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# File 'opal/opal/corelib/hash.rb', line 215

def clear
  %x{
    Opal.hash_init(self);
    return self;
  }
end

#cloneObject Also known as: dup


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# File 'opal/opal/corelib/hash.rb', line 222

def clone
  %x{
    var hash = new self.$$class();

    Opal.hash_init(hash);
    Opal.hash_clone(self, hash);

    return hash;
  }
end

#compactObject


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# File 'opal/opal/corelib/hash.rb', line 233

def compact
  %x{
    var hash = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      if (value !== nil) {
        Opal.hash_put(hash, key, value);
      }
    }

    return hash;
  }
end

#compact!Object


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# File 'opal/opal/corelib/hash.rb', line 256

def compact!
  %x{
    var changes_were_made = false;

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      if (value === nil) {
        if (Opal.hash_delete(self, key) !== undefined) {
          changes_were_made = true;
          length--;
          i--;
        }
      }
    }

    return changes_were_made ? self : nil;
  }
end

#compare_by_identityObject


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# File 'opal/opal/corelib/hash.rb', line 283

def compare_by_identity
  %x{
    var i, ii, key, keys = self.$$keys, identity_hash;

    if (self.$$by_identity) return self;
    if (self.$$keys.length === 0) {
      self.$$by_identity = true
      return self;
    }

    identity_hash = #{ {}.compare_by_identity };
    for(i = 0, ii = keys.length; i < ii; i++) {
      key = keys[i];
      if (!key.$$is_string) key = key.key;
      Opal.hash_put(identity_hash, key, Opal.hash_get(self, key));
    }

    self.$$by_identity = true;
    self.$$map = identity_hash.$$map;
    self.$$smap = identity_hash.$$smap;
    return self;
  }
end

#compare_by_identity?Boolean

Returns:


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# File 'opal/opal/corelib/hash.rb', line 307

def compare_by_identity?
  `self.$$by_identity === true`
end

#deconstruct_keys(_) ⇒ Object


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# File 'opal/opal/corelib/pattern_matching.rb', line 132

def deconstruct_keys(_)
  self
end

#default(key = undefined) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 311

def default(key = undefined)
  %x{
    if (key !== undefined && self.$$proc !== nil && self.$$proc !== undefined) {
      return self.$$proc.$call(self, key);
    }
    if (self.$$none === undefined) {
      return nil;
    }
    return self.$$none;
  }
end

#default=(object) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 323

def default=(object)
  %x{
    self.$$proc = nil;
    self.$$none = object;

    return object;
  }
end

#default_procObject


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# File 'opal/opal/corelib/hash.rb', line 332

def default_proc
  %x{
    if (self.$$proc !== undefined) {
      return self.$$proc;
    }
    return nil;
  }
end

#default_proc=(default_proc) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 341

def default_proc=(default_proc)
  %x{
    var proc = default_proc;

    if (proc !== nil) {
      proc = #{Opal.coerce_to!(`proc`, Proc, :to_proc)};

      if (#{`proc`.lambda?} && #{`proc`.arity.abs} !== 2) {
        #{raise TypeError, 'default_proc takes two arguments'};
      }
    }

    self.$$none = nil;
    self.$$proc = proc;

    return default_proc;
  }
end

#delete(key, &block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 360

def delete(key, &block)
  %x{
    var value = Opal.hash_delete(self, key);

    if (value !== undefined) {
      return value;
    }

    if (block !== nil) {
      return #{yield key};
    }

    return nil;
  }
end

#delete_if(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 376

def delete_if(&block)
  return enum_for(:delete_if) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj !== false && obj !== nil) {
        if (Opal.hash_delete(self, key) !== undefined) {
          length--;
          i--;
        }
      }
    }

    return self;
  }
end

#dig(key, *keys) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 406

def dig(key, *keys)
  item = self[key]

  %x{
    if (item === nil || keys.length === 0) {
      return item;
    }
  }

  unless item.respond_to?(:dig)
    raise TypeError, "#{item.class} does not have #dig method"
  end

  item.dig(*keys)
end

#each(&block) ⇒ Object Also known as: each_pair


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# File 'opal/opal/corelib/hash.rb', line 422

def each(&block)
  return enum_for(:each) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      Opal.yield1(block, [key, value]);
    }

    return self;
  }
end

#each_key(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 443

def each_key(&block)
  return enum_for(:each_key) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      block(key.$$is_string ? key : key.key);
    }

    return self;
  }
end

#each_value(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 459

def each_value(&block)
  return enum_for(:each_value) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      block(key.$$is_string ? self.$$smap[key] : key.value);
    }

    return self;
  }
end

#empty?Boolean

Returns:


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# File 'opal/opal/corelib/hash.rb', line 473

def empty?
  `self.$$keys.length === 0`
end

#except(*keys) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 479

def except(*keys)
  dup.except!(*keys)
end

#except!(*keys) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 483

def except!(*keys)
  keys.each { |key| delete(key) }
  self
end

#fetch(key, defaults = undefined, &block) ⇒ Object

Raises:


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# File 'opal/opal/corelib/hash.rb', line 488

def fetch(key, defaults = undefined, &block)
  %x{
    var value = Opal.hash_get(self, key);

    if (value !== undefined) {
      return value;
    }

    if (block !== nil) {
      return block(key);
    }

    if (defaults !== undefined) {
      return defaults;
    }
  }

  raise KeyError.new("key not found: #{key.inspect}", key: key, receiver: self)
end

#fetch_values(*keys, &block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 508

def fetch_values(*keys, &block)
  keys.map { |key| fetch(key, &block) }
end

#flatten(level = 1) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 512

def flatten(level = 1)
  level = Opal.coerce_to!(level, Integer, :to_int)

  %x{
    var result = [];

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      result.push(key);

      if (value.$$is_array) {
        if (level === 1) {
          result.push(value);
          continue;
        }

        result = result.concat(#{`value`.flatten(`level - 2`)});
        continue;
      }

      result.push(value);
    }

    return result;
  }
end

#has_key?(key) ⇒ Boolean Also known as: include?, key?, member?

Returns:


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# File 'opal/opal/corelib/hash.rb', line 547

def has_key?(key)
  `Opal.hash_get(self, key) !== undefined`
end

#has_value?(value) ⇒ Boolean Also known as: value?

Returns:


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# File 'opal/opal/corelib/hash.rb', line 551

def has_value?(value)
  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      if (#{`(key.$$is_string ? self.$$smap[key] : key.value)` == value}) {
        return true;
      }
    }

    return false;
  }
end

#hashObject


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# File 'opal/opal/corelib/hash.rb', line 565

def hash
  %x{
    var top = (Opal.hash_ids === undefined),
        hash_id = self.$object_id(),
        result = ['Hash'],
        key, item;

    try {
      if (top) {
        Opal.hash_ids = Object.create(null);
      }

      if (Opal[hash_id]) {
        return 'self';
      }

      for (key in Opal.hash_ids) {
        item = Opal.hash_ids[key];
        if (#{eql?(`item`)}) {
          return 'self';
        }
      }

      Opal.hash_ids[hash_id] = self;

      for (var i = 0, keys = self.$$keys, length = keys.length; i < length; i++) {
        key = keys[i];

        if (key.$$is_string) {
          result.push([key, self.$$smap[key].$hash()]);
        } else {
          result.push([key.key_hash, key.value.$hash()]);
        }
      }

      return result.sort().join();

    } finally {
      if (top) {
        Opal.hash_ids = undefined;
      }
    }
  }
end

#index(object) ⇒ Object Also known as: key


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# File 'opal/opal/corelib/hash.rb', line 612

def index(object)
  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      if (#{`value` == object}) {
        return key;
      }
    }

    return nil;
  }
end

#indexes(*args) ⇒ Object Also known as: indices, values_at


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# File 'opal/opal/corelib/hash.rb', line 633

def indexes(*args)
  %x{
    var result = [];

    for (var i = 0, length = args.length, key, value; i < length; i++) {
      key = args[i];
      value = Opal.hash_get(self, key);

      if (value === undefined) {
        result.push(#{default});
        continue;
      }

      result.push(value);
    }

    return result;
  }
end

#inspectObject Also known as: to_s


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# File 'opal/opal/corelib/hash.rb', line 657

def inspect
  %x{
    var top = (inspect_ids === undefined),
        hash_id = self.$object_id(),
        result = [];

    try {
      if (top) {
        inspect_ids = {};
      }

      if (inspect_ids.hasOwnProperty(hash_id)) {
        return '{...}';
      }

      inspect_ids[hash_id] = true;

      for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
        key = keys[i];

        if (key.$$is_string) {
          value = self.$$smap[key];
        } else {
          value = key.value;
          key = key.key;
        }

        result.push(key.$inspect() + '=>' + value.$inspect());
      }

      return '{' + result.join(', ') + '}';

    } finally {
      if (top) {
        inspect_ids = undefined;
      }
    }
  }
end

#invertObject


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# File 'opal/opal/corelib/hash.rb', line 697

def invert
  %x{
    var hash = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      Opal.hash_put(hash, value, key);
    }

    return hash;
  }
end

#keep_if(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 718

def keep_if(&block)
  return enum_for(:keep_if) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj === false || obj === nil) {
        if (Opal.hash_delete(self, key) !== undefined) {
          length--;
          i--;
        }
      }
    }

    return self;
  }
end

#keysObject


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# File 'opal/opal/corelib/hash.rb', line 750

def keys
  %x{
    var result = [];

    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        result.push(key);
      } else {
        result.push(key.key);
      }
    }

    return result;
  }
end

#lengthObject Also known as: size


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# File 'opal/opal/corelib/hash.rb', line 768

def length
  `self.$$keys.length`
end

#merge(*others, &block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 774

def merge(*others, &block)
  dup.merge!(*others, &block)
end

#merge!(*others, &block) ⇒ Object Also known as: update


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# File 'opal/opal/corelib/hash.rb', line 778

def merge!(*others, &block)
  %x{
    var i, j, other, other_keys, length, key, value, other_value;
    for (i = 0; i < others.length; ++i) {
      other = #{Opal.coerce_to!(`others[i]`, Hash, :to_hash)};
      other_keys = other.$$keys, length = other_keys.length;

      if (block === nil) {
        for (j = 0; j < length; j++) {
          key = other_keys[j];

          if (key.$$is_string) {
            other_value = other.$$smap[key];
          } else {
            other_value = key.value;
            key = key.key;
          }

          Opal.hash_put(self, key, other_value);
        }
      } else {
        for (j = 0; j < length; j++) {
          key = other_keys[j];

          if (key.$$is_string) {
            other_value = other.$$smap[key];
          } else {
            other_value = key.value;
            key = key.key;
          }

          value = Opal.hash_get(self, key);

          if (value === undefined) {
            Opal.hash_put(self, key, other_value);
            continue;
          }

          Opal.hash_put(self, key, block(key, value, other_value));
        }
      }
    }

    return self;
  }
end

#rassoc(object) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 825

def rassoc(object)
  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      if (#{`value` == object}) {
        return [key, value];
      }
    }

    return nil;
  }
end

#rehashObject


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# File 'opal/opal/corelib/hash.rb', line 846

def rehash
  %x{
    Opal.hash_rehash(self);
    return self;
  }
end

#reject(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 853

def reject(&block)
  return enum_for(:reject) { size } unless block

  %x{
    var hash = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj === false || obj === nil) {
        Opal.hash_put(hash, key, value);
      }
    }

    return hash;
  }
end

#reject!(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 880

def reject!(&block)
  return enum_for(:reject!) { size } unless block

  %x{
    var changes_were_made = false;

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj !== false && obj !== nil) {
        if (Opal.hash_delete(self, key) !== undefined) {
          changes_were_made = true;
          length--;
          i--;
        }
      }
    }

    return changes_were_made ? self : nil;
  }
end

#replace(other) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 911

def replace(other)
  other = Opal.coerce_to!(other, Hash, :to_hash)

  %x{
    Opal.hash_init(self);

    for (var i = 0, other_keys = other.$$keys, length = other_keys.length, key, value, other_value; i < length; i++) {
      key = other_keys[i];

      if (key.$$is_string) {
        other_value = other.$$smap[key];
      } else {
        other_value = key.value;
        key = key.key;
      }

      Opal.hash_put(self, key, other_value);
    }
  }

  if other.default_proc
    self.default_proc = other.default_proc
  else
    self.default = other.default
  end

  self
end

#select(&block) ⇒ Object Also known as: filter


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# File 'opal/opal/corelib/hash.rb', line 940

def select(&block)
  return enum_for(:select) { size } unless block

  %x{
    var hash = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj !== false && obj !== nil) {
        Opal.hash_put(hash, key, value);
      }
    }

    return hash;
  }
end

#select!(&block) ⇒ Object Also known as: filter!


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# File 'opal/opal/corelib/hash.rb', line 967

def select!(&block)
  return enum_for(:select!) { size } unless block

  %x{
    var result = nil;

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value, obj; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      obj = block(key, value);

      if (obj === false || obj === nil) {
        if (Opal.hash_delete(self, key) !== undefined) {
          length--;
          i--;
        }
        result = self;
      }
    }

    return result;
  }
end

#shiftObject


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# File 'opal/opal/corelib/hash.rb', line 1001

def shift
  %x{
    var keys = self.$$keys,
        key;

    if (keys.length > 0) {
      key = keys[0];

      key = key.$$is_string ? key : key.key;

      return [key, Opal.hash_delete(self, key)];
    }

    return self.$default(nil);
  }
end

#slice(*keys) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1020

def slice(*keys)
  %x{
    var result = Opal.hash();

    for (var i = 0, length = keys.length; i < length; i++) {
      var key = keys[i], value = Opal.hash_get(self, key);

      if (value !== undefined) {
        Opal.hash_put(result, key, value);
      }
    }

    return result;
  }
end

#to_aObject


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# File 'opal/opal/corelib/hash.rb', line 1038

def to_a
  %x{
    var result = [];

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      result.push([key, value]);
    }

    return result;
  }
end

#to_h(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1059

def to_h(&block)
  return map(&block).to_h if block_given?

  %x{
    if (self.$$class === Opal.Hash) {
      return self;
    }

    var hash = new Opal.Hash();

    Opal.hash_init(hash);
    Opal.hash_clone(self, hash);

    return hash;
  }
end

#to_hashObject


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# File 'opal/opal/corelib/hash.rb', line 1076

def to_hash
  self
end

#to_procObject


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# File 'opal/opal/corelib/hash.rb', line 1080

def to_proc
  proc do |key = undefined|
    %x{
      if (key == null) {
        #{raise ArgumentError, 'no key given'}
      }
    }

    self[key]
  end
end

#transform_keys(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1094

def transform_keys(&block)
  return enum_for(:transform_keys) { size } unless block

  %x{
    var result = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      key = Opal.yield1(block, key);

      Opal.hash_put(result, key, value);
    }

    return result;
  }
end

#transform_keys!(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1119

def transform_keys!(&block)
  return enum_for(:transform_keys!) { size } unless block

  %x{
    var keys = Opal.slice.call(self.$$keys),
        i, length = keys.length, key, value, new_key;

    for (i = 0; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      new_key = Opal.yield1(block, key);

      Opal.hash_delete(self, key);
      Opal.hash_put(self, new_key, value);
    }

    return self;
  }
end

#transform_values(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1146

def transform_values(&block)
  return enum_for(:transform_values) { size } unless block

  %x{
    var result = Opal.hash();

    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      value = Opal.yield1(block, value);

      Opal.hash_put(result, key, value);
    }

    return result;
  }
end

#transform_values!(&block) ⇒ Object


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# File 'opal/opal/corelib/hash.rb', line 1171

def transform_values!(&block)
  return enum_for(:transform_values!) { size } unless block

  %x{
    for (var i = 0, keys = self.$$keys, length = keys.length, key, value; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        value = self.$$smap[key];
      } else {
        value = key.value;
        key = key.key;
      }

      value = Opal.yield1(block, value);

      Opal.hash_put(self, key, value);
    }

    return self;
  }
end

#valuesObject


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# File 'opal/opal/corelib/hash.rb', line 1200

def values
  %x{
    var result = [];

    for (var i = 0, keys = self.$$keys, length = keys.length, key; i < length; i++) {
      key = keys[i];

      if (key.$$is_string) {
        result.push(self.$$smap[key]);
      } else {
        result.push(key.value);
      }
    }

    return result;
  }
end