Please check my code below.
const [x,,,y] = [1,2,3,4,5];
console.log(x,y);
what will it should return ?
I check it returns 1 4
But shouldn’t it have to return 1 5
I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make easier to read.
See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.
Note: Backticks are not single quotes.
Count your commas carefully.
Yes I’ve count it there are 3 commas means.
const [x , , , y] = [1,2,3,4,5];
console.log(x,y);
which means index 0 1 2 3 4 = 1 , , , 5
How many commas are there in [1,2,3,4,5]?
How many commas are there in [1,2,3,4,5] ?
4
And how many commas are there in [x,,,y]?
And how many commas are there in [x,,,y] ?
3
That’s why you are assigning 4 to y instead of 5.
You can also look at it visually to see how they “line up”:
[1,2,3,4,5]
[x, , ,y]