how can i have the first 3 elements of an array of variable length in Javascript

Question

i would like to get the first 3 elements of an array of variable length. i've sorted my array and i would like to get a Top 3.

here's what i've done :

var diffSplice = this.users.length - 1;
return this.users.sort(this.triDec).splice(0,diffSplice)

my "solution" work only for an array of 4 element ( -1 )

Is there a better way to use the splice method ?

Thanks for your help

Did you try [`Array.prototype.slice()`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/slice)? — rink.attendant.6, Aug 09 '17 at 15:58

score 3 · Accepted Answer · answered Aug 09 '17 at 15:58

3

You could use Array#slice for the first three items.

return this.users.sort(this.triDec).slice(0, 3);

answered Aug 09 '17 at 15:58

Nina Scholz

score 1 · Answer 2 · answered Aug 09 '17 at 15:58

1

Don't you want to use a const value for diffSplice like

var diffSplice = 3;
return this.users.sort(this.triDec).slice(0,diffSplice)

try running

let arr = [1, 2, 3, 4, 5];
console.log(arr.slice(0, 3));

answered Aug 09 '17 at 15:58

marvel308

score -1 · Answer 3 · answered Aug 09 '17 at 15:59

-1

Fill out the deletecount for Splice:

var sortedArray = this.users.sort(this.triDec);
return sortedArray.splice(0, 3);

check MDN

answered Aug 09 '17 at 15:59

Luuuud

Why the downvote? For using `splice` instead of `slice`? OP didn't mention the original array should be maintained. – Luuuud Aug 09 '17 at 16:01

3 Answers3