Just some useful JavaScript functions

Tools.js

/**
 * Useful functions
 */
var Tools = function() {};

/**
 * Checks a value is not null or undefined
 * @param test
 * @return {Boolean}
 */
Tools.isSet = function(test) {
	return (test === null || typeof test != undefined);
};

/**
 * Checks if the value is a valid number
 * @param n {*}
 * @return {Boolean}
 */
Tools.isNumber = function(n) {
	return !isNaN(parseFloat(n)) && isFinite(n);
};

/**
 * Handles errors by chucking them at the log
 * @param error {*}
 * @param context {*}
 */
Tools.handleError = function(error, context) {
	console.log('An error occured');
	console.log(error);
	console.log(context);
}

/**
 * Returns current value if set (or not Empty if notEmpty is true) or default value otherwise.
 * @param currentValue {*} The value to check
 * @param defaultValue {*} The value to replace it with
 * @param notEmpty {boolean} Set to true if the value should not be empty
 * @return {*}
 */
Tools.default = function(currentValue, defaultValue, notEmpty) {
	if(!Tools.isSet(currentValue))
		currentValue = defaultValue;
	if(Tools.isSet(notEmpty) && !Tools.isSet(currentValue))
		currentValue = defaultValue;
	return currentValue;
}