Manipulating arrays in code is a very common operation. Whether you are creating a total for a shopping cart, grabbing only the first names out of a list of people, or moving a piece on a chessboard, ...

Learn how JavaScript’s built-in functions like map() and filter(), as well as compose() and chain(), support a more elegant handling of JavaScript arrays.

$ cd lab-javascript-functions-and-arrays $ npm install $ npm run test:watch In case you want to check the tests, they are in the tests/functions-and-arrays.spec.js file. Open the lab-solution.html ...