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							24 lines
						
					
					
						
							917 B
						
					
					
				
			
		
		
	
	
							24 lines
						
					
					
						
							917 B
						
					
					
				'use strict'; | 
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// https://github.com/tc39/proposal-iterator-helpers | 
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var $ = require('../internals/export'); | 
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var apply = require('../internals/function-apply'); | 
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var aCallable = require('../internals/a-callable'); | 
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var anObject = require('../internals/an-object'); | 
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var createIteratorProxy = require('../internals/iterator-create-proxy'); | 
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var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing'); | 
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 | 
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var IteratorProxy = createIteratorProxy(function (args) { | 
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  var iterator = this.iterator; | 
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  var result = anObject(apply(this.next, iterator, args)); | 
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  var done = this.done = !!result.done; | 
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  if (!done) return callWithSafeIterationClosing(iterator, this.mapper, result.value); | 
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}); | 
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 | 
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$({ target: 'Iterator', proto: true, real: true, forced: true }, { | 
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  map: function map(mapper) { | 
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    return new IteratorProxy({ | 
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      iterator: anObject(this), | 
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      mapper: aCallable(mapper) | 
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    }); | 
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  } | 
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});
 | 
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