Loops

for

Best when you know how many times.

while

Best when driven by a condition.

for...of

Cleanest for arrays/strings.

for...in

Iterates object keys.

Example

for(let i=0;i<5;i++) console.log(i);

for(const fruit of ['apple','banana']){
  console.log(fruit);
}

const user={name:'Alice',age:25};
for(const key in user){
  console.log(key,':',user[key]);
}

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Related Resources

JavaScript Reference

Complete tag & property list

JavaScript How-To Guides

Step-by-step practical guides

JavaScript Exercises

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