JavaScript from Beginner to Professional

5

Loops

We are starting to get a good basic grasp of JavaScript. This chapter will focus on a very important control flow concept: loops. Loops execute a code block a certain number of times. We can use loops to do many things, such as repeating operations a number of times and iterating over data sets, arrays, and objects. Whenever you feel the need to copy a little piece of code and place it right underneath where you copied it from, you should probably be using a loop instead.

We will first discuss the basics of loops, then continue to discuss nesting loops, which is basically using loops inside loops. Also, we will explain looping over two complex constructs we have seen, arrays and objects. And finally, we will introduce two keywords related ...