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- 'use strict';
-
- var toStr = Object.prototype.toString;
-
- var isPrimitive = require('./helpers/isPrimitive');
-
- var isCallable = require('is-callable');
-
- // http://ecma-international.org/ecma-262/5.1/#sec-8.12.8
- var ES5internalSlots = {
- '[[DefaultValue]]': function (O) {
- var actualHint;
- if (arguments.length > 1) {
- actualHint = arguments[1];
- } else {
- actualHint = toStr.call(O) === '[object Date]' ? String : Number;
- }
-
- if (actualHint === String || actualHint === Number) {
- var methods = actualHint === String ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
- var value, i;
- for (i = 0; i < methods.length; ++i) {
- if (isCallable(O[methods[i]])) {
- value = O[methods[i]]();
- if (isPrimitive(value)) {
- return value;
- }
- }
- }
- throw new TypeError('No default value');
- }
- throw new TypeError('invalid [[DefaultValue]] hint supplied');
- }
- };
-
- // http://ecma-international.org/ecma-262/5.1/#sec-9.1
- module.exports = function ToPrimitive(input) {
- if (isPrimitive(input)) {
- return input;
- }
- if (arguments.length > 1) {
- return ES5internalSlots['[[DefaultValue]]'](input, arguments[1]);
- }
- return ES5internalSlots['[[DefaultValue]]'](input);
- };
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