most/lib/iterable.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isIterable = isIterable;
exports.getIterator = getIterator;
exports.makeIterable = makeIterable;
/** @license MIT License (c) copyright 2010-2016 original author or authors */
/** @author Brian Cavalier */
/** @author John Hann */

/*global Set, Symbol*/
var iteratorSymbol;
// Firefox ships a partial implementation using the name @@iterator.
// https://bugzilla.mozilla.org/show_bug.cgi?id=907077#c14
if (typeof Set === 'function' && typeof new Set()['@@iterator'] === 'function') {
  iteratorSymbol = '@@iterator';
} else {
  iteratorSymbol = typeof Symbol === 'function' && Symbol.iterator || '_es6shim_iterator_';
}

function isIterable(o) {
  return typeof o[iteratorSymbol] === 'function';
}

function getIterator(o) {
  return o[iteratorSymbol]();
}

function makeIterable(f, o) {
  o[iteratorSymbol] = f;
  return o;
}