jsTools: $utils 
Installation
npm install jstools-utils --save
or
bower install jstools-utils --save
Usage
Underscore object '_' with useful functions
_.isFunction(object)
_.isObject(object)
_.isString(object)
_.isArray(object)
_.isNumber(object)
_.key()
_.keys(object) // Object.keys() alias
_.extend(object, source)