15 lines
		
	
	
		
			401 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			15 lines
		
	
	
		
			401 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
| "use strict";
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| 
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| module.exports = function () {
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| 	var arr = [1, "foo"], iterator, result;
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| 	if (typeof arr.keys !== "function") return false;
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| 	iterator = arr.keys();
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| 	if (!iterator) return false;
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| 	if (typeof iterator.next !== "function") return false;
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| 	result = iterator.next();
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| 	if (!result) return false;
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| 	if (result.value !== 0) return false;
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| 	if (result.done !== false) return false;
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| 	return true;
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| };
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