for loops

Use an iterator to execute code a specified number of times:

Python	JavaScript
names = ["Alice","Bob","Carol"] for x in names: print(x)	const names = ["Alice","Bob","Carol"] for (let i = 0; i < names.length; i++) { console.log(names[i]) }

Now, you may be wondering, "if JavaScript has a for..in loop, why aren't we using it?". As it turns out, for/in of Python and for..in of JavaScript are false cognates: their names look alike but are very different in use. We'll discuss JavaScript's for..in loop shortly. Also, note how we needed to have three clauses in our for loop:

Figure 3.1 - Declaration, Condition, and Execution stages of a for loop

The declaration will either define an iterator or use an existing mutable variable. Note that it should be a mutable number!

Our condition is what we're testing. We want our loop to run while i is less than names.length. Since name...