Class: PurePromise::Coercer

Inherits:
Object
  • Object
show all
Defined in:
lib/pure_promise/coercer.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(thenable, promise_class) ⇒ Coercer

Returns a new instance of Coercer.

Raises:

  • (TypeError) 


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# File 'lib/pure_promise/coercer.rb', line 16

def initialize(thenable, promise_class)
  raise TypeError, 'Can only coerce a thenable' unless self.class.is_thenable?(thenable)
  @thenable = thenable
  @promise_class = promise_class
end

Class Method Details

.coerce(*args, &block) ⇒ Object 



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# File 'lib/pure_promise/coercer.rb', line 12

def self.coerce(*args, &block)
  new(*args, &block).coerce
end

.is_thenable?(thenable) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pure_promise/coercer.rb', line 8

def self.is_thenable?(thenable)
  thenable.respond_to?(:then)
end

Instance Method Details

#coerce ⇒ Object 



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# File 'lib/pure_promise/coercer.rb', line 22

def coerce
  return @thenable if @thenable.instance_of?(@promise_class)

  @mutated = false
  coerce_thenable
end