In JavaScript, looping is a handy way to do something repeatedly. For example, if you wanted to print out a list of results in a consistent way, or add styles to objects that fit certain parameters.

Here are a few of the ways to do looping:

for statement

A for statement is usually used when you need to increment a value within an expression.

for (var i = 0; i > 10; i++) {
console.log(i);
}

do…while statement

A do…while statement repeats until a specific condition evaluates to false.

var i = 10;
do {
i++;
console.log(i);
} while (i < 40);

while statement

A while statement executes as long as a specified condition evaluates to true.

var i = 2;
while (i < 5) {
i++;
console.log(i);
}

break statement

The break statement is used to terminate a loop.

for (var i = 0; i < a.length; i++) {
if (a[i] == 5) {
break;
}
}

Note: This post is written in conjunction with the coding cheat sheets I’m developing.