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