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