JavaScript, forEach array of object stop at condition

Question

I have an array of objects called columns and a array of strings values called keys

I'm trying to execute some code when col.name be !== to the value of key

    columns.forEach((col, i) => {
      if (col.name !== keys[i]) {
          console.log('yes, I entered the if statement')
        //do something here
      }
    });

The loop ends but no code is being executed, except the console log inside. I want to stop at first !==, not to loop the entires values of columns How can I do it? I read the use of every, or a simple for loop but I can't do it with an array of object.

especially since foreach instruction is much slower than for. — Jean-Claude Colette, Jan 10 '20 at 14:06
I'd say, if you want to `find` certain element and do thing on it, do not use `forEach`. (nor `some` as Nina's answer says.) Although it'd probably never change the behavior, better keep the intent clear. — apple apple, Jan 10 '20 at 14:08

score 3 · Accepted Answer · answered Jan 10 '20 at 13:58

3

You could take Array#some and return true to stop the iteration.

columns.some((col, i) => {
    if (col.name !== keys[i]) {
        console.log('yes, I entered the if statement')
        //do something here
        return true;
    }
});

answered Jan 10 '20 at 13:58

Nina Scholz

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I tried but, maybe my code is wrong, I need to return a false because I want to stop the whole code that is inside a function. I did it with a simple `for` instead. But your answer is correct, because I ask "how to do this with a forEach" explicity, and not "how can I loop an array and stop" – pmiranda Jan 10 '20 at 14:22

JavaScript, forEach array of object stop at condition

1 Answers1