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- /*!
- * is-number <https://github.com/jonschlinkert/is-number>
- *
- * Copyright (c) 2014-2017, Jon Schlinkert.
- * Released under the MIT License.
- */
- 'use strict';
- module.exports = function isNumber(num) {
- var type = typeof num;
- if (type === 'string' || num instanceof String) {
- // an empty string would be coerced to true with the below logic
- if (!num.trim()) return false;
- } else if (type !== 'number' && !(num instanceof Number)) {
- return false;
- }
- return (num - num + 1) >= 0;
- };
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