is-number.js 264 Bytes Raw Blame History Permalink 1 2 3 4 5 6 7 8 9 10 "use strict"; var objToString = Object.prototype.toString, id = objToString.call(1); module.exports = function (value) { return ( typeof value === "number" || (value instanceof Number || (typeof value === "object" && objToString.call(value) === id)) ); };