var ctx = require('./_ctx');
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var call = require('./_iter-call');
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var isArrayIter = require('./_is-array-iter');
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var anObject = require('./_an-object');
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var toLength = require('./_to-length');
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var getIterFn = require('./core.get-iterator-method');
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var BREAK = {};
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var 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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var f = ctx(fn, that, entries ? 2 : 1);
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var index = 0;
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var 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;
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