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