| 'use strict'; |
| // https://github.com/tc39/proposal-iterator-helpers |
| var aFunction = require('../internals/a-function'); |
| var anObject = require('../internals/an-object'); |
| var getBuiltIn = require('../internals/get-built-in'); |
| |
| var Promise = getBuiltIn('Promise'); |
| var push = [].push; |
| |
| var createMethod = function (TYPE) { |
| var IS_TO_ARRAY = TYPE == 0; |
| var IS_FOR_EACH = TYPE == 1; |
| var IS_EVERY = TYPE == 2; |
| var IS_SOME = TYPE == 3; |
| return function (iterator, fn) { |
| anObject(iterator); |
| var next = aFunction(iterator.next); |
| var array = IS_TO_ARRAY ? [] : undefined; |
| if (!IS_TO_ARRAY) aFunction(fn); |
| |
| return new Promise(function (resolve, reject) { |
| var loop = function () { |
| try { |
| Promise.resolve(anObject(next.call(iterator))).then(function (step) { |
| try { |
| if (anObject(step).done) { |
| resolve(IS_TO_ARRAY ? array : IS_SOME ? false : IS_EVERY || undefined); |
| } else { |
| var value = step.value; |
| if (IS_TO_ARRAY) { |
| push.call(array, value); |
| loop(); |
| } else { |
| Promise.resolve(fn(value)).then(function (result) { |
| if (IS_FOR_EACH) { |
| loop(); |
| } else if (IS_EVERY) { |
| result ? loop() : resolve(false); |
| } else { |
| result ? resolve(IS_SOME || value) : loop(); |
| } |
| }, reject); |
| } |
| } |
| } catch (err) { reject(err); } |
| }, reject); |
| } catch (error) { reject(error); } |
| }; |
| |
| loop(); |
| }); |
| }; |
| }; |
| |
| module.exports = { |
| toArray: createMethod(0), |
| forEach: createMethod(1), |
| every: createMethod(2), |
| some: createMethod(3), |
| find: createMethod(4) |
| }; |