How forEach can be totally useless

javascript forEach is not a function (?)

UpdatedOctober 7, 2021

Comments (2)

Hahaha I'm flattered to be such inspiration to you with this article. It's dumb of me to program all this years without even knowing the foreach's existance... But now with this I know a little more. Txs and keep the good teaching ^^

Marcelo Zárate4y ago

It's not dumb at all! As I said

"go by so many years without using it and by no means being powerless in his ability to make quality code."

Thanks for the inspiration and for stopping by!

Pavittar Singh4y ago

I usually avoid forEach in JavaScript because it at times behaves weirdly.

I prefer map, filter and reduce methods, or the plain classic or the while sometimes. 😅

Marcelo Zárate4y ago

I usually avoid it in JS too!

Never underestimate the power of the classic syntax. It survived so many years and a lot of great software is built upon it.

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Marcelo Zárate

14 posts

Doesn't keep a reference to the current index

This doesn't mean you can't get the index of the current item inside a for each. It's just that it (usually) was not designed for it. Attempting that would mean extra work. From getting an index from a callback, up to finding the current element in the collection you are already iterating. It would be smarter just to use another kind of loop.

For each usually describes

"Apply this action to every item"

Instead of another kind of loops that are meant for

"Do this x times"

"Do this for items numbered a,b,x..."

Python

for beer in beers: print(beer.name) print(beer.IBU) print(beer.ABV)

The interesting thing about foreach in python, is that it actually is the standard for loop. If you want the classic for (int i=0; i<array.length; i++)

for i in range(0, len(array)): # Do whatever with i as index

See you around!

So tell me, do you find for each loop useful? In which language do you use it?

How forEach can be totally useless

Comments (2)

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Comments (2)

More from this blog

For each features

Traversing items in a collection

It is a loop sentence

Doesn't keep a reference to the current index

Performance for != foreach

Code

Pseudo-code

Javascript

PHP

Python