| 'use strict'; |
| |
| var strCompare = require('../string/#/case-insensitive-compare') |
| , isObject = require('./is-object') |
| |
| , resolve, typeMap; |
| |
| typeMap = { |
| undefined: 0, |
| object: 1, |
| boolean: 2, |
| string: 3, |
| number: 4 |
| }; |
| |
| resolve = function (a) { |
| if (isObject(a)) { |
| if (typeof a.valueOf !== 'function') return NaN; |
| a = a.valueOf(); |
| if (isObject(a)) { |
| if (typeof a.toString !== 'function') return NaN; |
| a = a.toString(); |
| if (typeof a !== 'string') return NaN; |
| } |
| } |
| return a; |
| }; |
| |
| module.exports = function (a, b) { |
| if (a === b) return 0; // Same |
| |
| a = resolve(a); |
| b = resolve(b); |
| if (a == b) return typeMap[typeof a] - typeMap[typeof b]; //jslint: ignore |
| if (a == null) return -1; |
| if (b == null) return 1; |
| if ((typeof a === 'string') || (typeof b === 'string')) { |
| return strCompare.call(a, b); |
| } |
| if ((a !== a) && (b !== b)) return 0; //jslint: ignore |
| return Number(a) - Number(b); |
| }; |
