core-js
Version:
Standard library
19 lines • 940 B
JavaScript
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');
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;
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++){
entries ? f(anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);
} else for(iterator = iterFn.call(iterable); !(step = iterator.next()).done; ){
call(iterator, f, step.value, entries);
}
};