var bind = require('../internals/function-bind-context'); var call = require('../internals/function-call'); var anObject = require('../internals/an-object'); var tryToString = require('../internals/try-to-string'); var isArrayIteratorMethod = require('../internals/is-array-iterator-method'); var lengthOfArrayLike = require('../internals/length-of-array-like'); var isPrototypeOf = require('../internals/object-is-prototype-of'); var getIterator = require('../internals/get-iterator'); var getIteratorMethod = require('../internals/get-iterator-method'); var iteratorClose = require('../internals/iterator-close'); var $TypeError = TypeError; var Result = function (stopped, result) { this.stopped = stopped; this.result = result; }; var ResultPrototype = Result.prototype; module.exports = function (iterable, unboundFunction, options) { var that = options && options.that; var AS_ENTRIES = !!(options && options.AS_ENTRIES); var IS_ITERATOR = !!(options && options.IS_ITERATOR); var INTERRUPTED = !!(options && options.INTERRUPTED); var fn = bind(unboundFunction, that); var iterator, iterFn, index, length, result, next, step; var stop = function (condition) { if (iterator) iteratorClose(iterator, 'normal', condition); return new Result(true, condition); }; var callFn = function (value) { if (AS_ENTRIES) { anObject(value); return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]); } return INTERRUPTED ? fn(value, stop) : fn(value); }; if (IS_ITERATOR) { iterator = iterable; } else { iterFn = getIteratorMethod(iterable); if (!iterFn) throw $TypeError(tryToString(iterable) + ' is not iterable'); // optimisation for array iterators if (isArrayIteratorMethod(iterFn)) { for (index = 0, length = lengthOfArrayLike(iterable); length > index; index++) { result = callFn(iterable[index]); if (result && isPrototypeOf(ResultPrototype, result)) return result; } return new Result(false); } iterator = getIterator(iterable, iterFn); } next = iterator.next; while (!(step = call(next, iterator)).done) { try { result = callFn(step.value); } catch (error) { iteratorClose(iterator, 'throw', error); } if (typeof result == 'object' && result && isPrototypeOf(ResultPrototype, result)) return result; } return new Result(false); };