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25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
var ctx = require('./_ctx')
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, call = require('./_iter-call')
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, isArrayIter = require('./_is-array-iter')
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, anObject = require('./_an-object')
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, toLength = require('./_to-length')
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, getIterFn = require('./core.get-iterator-method')
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, BREAK = {}
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, RETURN = {};
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var exports = module.exports = function(iterable, entries, fn, that, ITERATOR){
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var iterFn = ITERATOR ? function(){ return iterable; } : getIterFn(iterable)
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, f = ctx(fn, that, entries ? 2 : 1)
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, index = 0
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, length, step, iterator, result;
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if(typeof iterFn != 'function')throw TypeError(iterable + ' is not iterable!');
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// fast case for arrays with default iterator
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if(isArrayIter(iterFn))for(length = toLength(iterable.length); length > index; index++){
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result = entries ? f(anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);
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if(result === BREAK || result === RETURN)return result;
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} else for(iterator = iterFn.call(iterable); !(step = iterator.next()).done; ){
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result = call(iterator, f, step.value, entries);
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if(result === BREAK || result === RETURN)return result;
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}
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};
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exports.BREAK = BREAK;
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exports.RETURN = RETURN; |