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