underscore.isnumeric/underscore.isNumeric.js

Adds an isNumeric method to Underscore based on the jQuery.isNumeric implementation.

(function (root, factory) {
	// AMD. Register as an anonymous module.
	if (typeof define === 'function' && define.amd) {
		define(['exports', 'underscore'], factory);
	}
	// CommonJS
	else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {
		var _;

		// Atempt to load lodash.
		try {
			_ = require('lodash');
		}
		catch (err) {}

		// Attempt to load underscore if lodash was unavailable.
		if ('undefined' === typeof _) {
			try {
				_ = require('underscore');
			}
			catch (err) {}
		}

		// If neither lodash nor underscore was available throw an error.
		if ('undefined' === typeof _) {
			throw 'UnderscoreJS (or compatible alternative) not found.';
		}

		factory(exports, _);
	}
	// Browser globals
	else {
		factory((root.commonJsStrict = {}), root.underscore);
	}
}(this, function (exports, _) {
	_.mixin({
		/**
		 * An implementation of jQuery's isNumeric in for UnderscoreJS.
		 *
		 * parseFloat NaNs numeric-cast false positives (null|true|false|"") but misinterprets
		 * leading-number strings, particularly hex literals ("0x...").
		 *
		 * Subtraction forces infinities to NaN.
		 *
		 * Adding 1 corrects loss of precision from parseFloat (#15100).
		 *
		 * @return  void
		 */
		isNumeric: function (object) {
			var stringObject = object && object.toString();
			return !_.isArray(object) && (stringObject - parseFloat(stringObject) + 1) >= 0;
		}
	});
}));