Class: Random
- Defined in:
- opal/opal/corelib/random.rb,
opal/opal/corelib/random/seedrandom.js.rb,
opal/opal/corelib/random/math_random.js.rb,
opal/opal/corelib/random/mersenne_twister.js.rb
Constant Summary
- SEEDRANDOM_GENERATOR =
`{ new_seed: function() { return Math.abs($seed_generator.int32()); }, reseed: function(seed) { return new seedrandom(seed); }, rand: function($rng) { return $rng.quick(); } }`
- MATH_RANDOM_GENERATOR =
`{ new_seed: function() { return 0; }, reseed: function(seed) { return {}; }, rand: function($rng) { return Math.random(); } }`
- MERSENNE_TWISTER_GENERATOR =
`{ new_seed: function() { return Math.round(Math.random() * MAX_INT); }, reseed: function(seed) { return MersenneTwister.init(seed); }, rand: function(mt) { return MersenneTwister.genrand_real(mt); } }`
Instance Attribute Summary collapse
-
#seed ⇒ Object
readonly
Returns the value of attribute seed.
-
#state ⇒ Object
readonly
Returns the value of attribute state.
Class Method Summary collapse
- .generator=(generator) ⇒ Object
- .new_seed ⇒ Object
- .rand(limit = undefined) ⇒ Object
- .srand(n = Random.new_seed) ⇒ Object
- .urandom(size) ⇒ Object
Instance Method Summary collapse
- #==(other) ⇒ Object
- #bytes(length) ⇒ Object
-
#initialize(seed = Random.new_seed) ⇒ Random
constructor
A new instance of Random.
- #rand(limit = undefined) ⇒ Object
- #reseed(seed) ⇒ Object
Constructor Details
Instance Attribute Details
#seed ⇒ Object (readonly)
Returns the value of attribute seed
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# File 'opal/opal/corelib/random.rb', line 2 def seed @seed end |
#state ⇒ Object (readonly)
Returns the value of attribute state
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# File 'opal/opal/corelib/random.rb', line 2 def state @state end |
Class Method Details
.generator=(generator) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 116 def self.generator=(generator) `Opal.$$rand = #{generator}` if const_defined? :DEFAULT DEFAULT.reseed else const_set :DEFAULT, new(new_seed) end end |
.new_seed ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 15 def self.new_seed `Opal.$$rand.new_seed()` end |
.rand(limit = undefined) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 19 def self.rand(limit = undefined) DEFAULT.rand(limit) end |
.srand(n = Random.new_seed) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 23 def self.srand(n = Random.new_seed) n = Opal.coerce_to!(n, Integer, :to_int) previous_seed = DEFAULT.seed DEFAULT.reseed(n) previous_seed end |
.urandom(size) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 31 def self.urandom(size) size = Opal.coerce_to!(size, Integer, :to_int) if size < 0 raise ArgumentError, 'negative string size (or size too big)' end Array.new(size) { rand(255).chr }.join.encode('ASCII-8BIT') end |
Instance Method Details
#==(other) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 41 def ==(other) return false unless Random === other seed == other.seed && state == other.state end |
#bytes(length) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 47 def bytes(length) length = Opal.coerce_to!(length, Integer, :to_int) Array.new(length) { rand(255).chr }.join.encode('ASCII-8BIT') end |
#rand(limit = undefined) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 53 def rand(limit = undefined) %x{ function randomFloat() { self.state++; return Opal.$$rand.rand(self.$rng); } function randomInt() { return Math.floor(randomFloat() * limit); } function randomRange() { var min = limit.begin, max = limit.end; if (min === nil || max === nil) { return nil; } var length = max - min; if (length < 0) { return nil; } if (length === 0) { return min; } if (max % 1 === 0 && min % 1 === 0 && !limit.excl) { length++; } return self.$rand(length) + min; } if (limit == null) { return randomFloat(); } else if (limit.$$is_range) { return randomRange(); } else if (limit.$$is_number) { if (limit <= 0) { #{raise ArgumentError, "invalid argument - #{limit}"} } if (limit % 1 === 0) { // integer return randomInt(); } else { return randomFloat() * limit; } } else { limit = #{Opal.coerce_to!(limit, Integer, :to_int)}; if (limit <= 0) { #{raise ArgumentError, "invalid argument - #{limit}"} } return randomInt(); } } end |
#reseed(seed) ⇒ Object
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# File 'opal/opal/corelib/random.rb', line 10 def reseed(seed) @seed = seed `self.$rng = Opal.$$rand.reseed(seed)` end |