Around and Around with Loops
It’s common in programming to test for a particular condition and repeat the test as many times as needed. Let’s use an example you probably know well: doing a search and replace in a word processor. You search for one bit of text, change it to a different text string, and then repeat the process for all of the instances of the first string in the document. Now imagine that you have a program that does it for you automatically. The program would execute a loop, which lets it repeat an action a specified number of times. In JavaScript, loops become a vital part of your scripting toolbox.
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