SetTimeout function with parameter and without Javascript

Question

I confused what the differences between these 2 options and if there is a better one the parameter in the timeout function is outside

function createPost(){
  setTimeout(function(post){
    posts.push(post);
  }, 2000);
}

at another function parameter inside createPost function

function createPost(post){
  setTimeout(function(){
    posts.push(post);
  }, 2000);
}

Solution:

there are 2 different things and only the 2nd option will work

The first will give you an error unless you pass an array as a third argument to setTimeout — Nick Parsons, Feb 07 '20 at 11:08
Related: [Global variable is logged as undefined when passed as parameter to setTimeout callback function](/q/32326721/4642212). — Sebastian Simon, Sep 30 '21 at 03:43

score 1 · Accepted Answer · answered Feb 07 '20 at 11:04

1

setTimout's first parameter is a callback function that will be executed after the timeout. It simply calls the function. It doesn't pass any parameters to it.

The second option is the only one that will work. You'll call createPost(post) and it will push to the array after the timeout that post.

answered Feb 07 '20 at 11:04

Vlad Gincher

1,052
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20

thanks and sorry about the not good question I am just a beginner – itay k Feb 07 '20 at 11:07
1

Thats ok, I'm not one of those who downvoted the question. But you should do more research before asking here, you could have tried to execute it and see that only the second one works. – Vlad Gincher Feb 07 '20 at 11:09

SetTimeout function with parameter and without Javascript

1 Answers1