Arrow functions, a feature of ECMAScript 6, are the latest style for declaring functions as first class entities in JavaScript. The brevity of the arrow function syntax is often their first cited advantage.
Jasmine is a framework for unit testing Javascript code. It has an easy syntax that allows fast creation of human readable, spec-like test code to verify the correct behavior of Java application code. When creating a new npm project that will use jasmine for testing, specify “jasmine” as the test script
Bookmarklets provide a way to add small customized tools to your browser. They look like regular bookmarks, but instead of having a “http:” address to a page on the web, they contain Javascript code that runs whenever the bookmarklet is clicked. Here’s the obligatory “Hello World” demonstration of a bookmarklet: create a new bookmark in
jQuery is a widely used framework for inspecting and manipulating the DOM in modern browsers. It’s often one of the fundamental libraries that’s used in major websites, even underlying higher level frameworks like Backbone and AngularJS. But JQuery can also be used as a tool for experimentation, prototyping, and testing ideas and features interactively in