source: imaps-frontend/node_modules/es-to-primitive/es2015.js@ d565449

'use strict';

var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';

var isPrimitive = require('./helpers/isPrimitive');
var isCallable = require('is-callable');
var isDate = require('is-date-object');
var isSymbol = require('is-symbol');

var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) {
        if (typeof O === 'undefined' || O === null) {
                throw new TypeError('Cannot call method on ' + O);
        }
        if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) {
                throw new TypeError('hint must be "string" or "number"');
        }
        var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
        var method, result, i;
        for (i = 0; i < methodNames.length; ++i) {
                method = O[methodNames[i]];
                if (isCallable(method)) {
                        result = method.call(O);
                        if (isPrimitive(result)) {
                                return result;
                        }
                }
        }
        throw new TypeError('No default value');
};

var GetMethod = function GetMethod(O, P) {
        var func = O[P];
        if (func !== null && typeof func !== 'undefined') {
                if (!isCallable(func)) {
                        throw new TypeError(func + ' returned for property ' + P + ' of object ' + O + ' is not a function');
                }
                return func;
        }
        return void 0;
};

// http://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive
module.exports = function ToPrimitive(input) {
        if (isPrimitive(input)) {
                return input;
        }
        var hint = 'default';
        if (arguments.length > 1) {
                if (arguments[1] === String) {
                        hint = 'string';
                } else if (arguments[1] === Number) {
                        hint = 'number';
                }
        }

        var exoticToPrim;
        if (hasSymbols) {
                if (Symbol.toPrimitive) {
                        exoticToPrim = GetMethod(input, Symbol.toPrimitive);
                } else if (isSymbol(input)) {
                        exoticToPrim = Symbol.prototype.valueOf;
                }
        }
        if (typeof exoticToPrim !== 'undefined') {
                var result = exoticToPrim.call(input, hint);
                if (isPrimitive(result)) {
                        return result;
                }
                throw new TypeError('unable to convert exotic object to primitive');
        }
        if (hint === 'default' && (isDate(input) || isSymbol(input))) {
                hint = 'string';
        }
        return ordinaryToPrimitive(input, hint === 'default' ? 'number' : hint);
};