FAQ: Loops - For Each Loop

This community-built FAQ covers the “For Each Loop” exercise from the lesson “Loops”.

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Hello,

Can someone explain foreach and it’s usage, preferably with some code examples?

Array.prototype.forEach() is a less verbose form of a for of loop.

a = [2, 4, 6, 8, 9, 11, 13, 15]
for (let x of a) {
    console.log(`${x} is ${x % 2 ? `odd` : `even`}`);
}

versus,

const evenOdd = x => {
  console.log(`${x} is ${x % 2 ? `odd` : `even`}`);
}
a.forEach(evenOdd)

Both will output the same thing…

2 is even
4 is even
6 is even
8 is even
9 is odd
11 is odd
13 is odd
15 is odd

The advantage is that rather than having a one-off expression in the for loop, we have a re-usable, standalone function that can be shared with the rest the program. evenOdd() is known as a callback, that might have already come up in lessons, but if not, it will soon in Higher Order Functions.

.forEach() has no return value, and the iteration cycle cannot be broken (terminated with break. A for loop can contain a breaking condition, if needed.

This is in the section of C#, for some reason @communitybot did not put a category on that, strange. At least, this is where the link exists.

D’oh! Mistook it as a JavaScript topic. C and JS have very similar syntax so some of the above may still apply, apart from the ES6 template literal.

That’s the kind of information you can find in documentation. Already exists, google will show you where.