Sometimes, we want to splice a JavaScript array in half regardless of the size.
In this article, we’ll look at how to splice a JavaScript array in half regardless of the size.
Splice a JavaScript Array in Half Regardless of the Size
To splice a JavaScript array in half regardless of the size, we can use the slice method with the index of the middle element.
For instance, we can write:
const arr = [1, 2, 3, 4, 5, 6]
const halfwayThrough = Math.floor(arr.length / 2)
const arrayFirstHalf = arr.slice(0, halfwayThrough);
const arraySecondHalf = arr.slice(halfwayThrough, arr.length);
console.log(arrayFirstHalf, arraySecondHalf)
We have the arr array that we want to split in 2.
To do this, we get the index of the middle element with:
const halfwayThrough = Math.floor(arr.length / 2)
We take the floor of the length divided by 2 with Math.floor .
Then we get the first half with:
const arrayFirstHalf = arr.slice(0, halfwayThrough);
that returns the first 3 elements of arr with slice .
slice takes the first index of the element and 1 after the index of the last element we want to include with the returned array respectively.
Then we get the 2nd half with:
const arraySecondHalf = arr.slice(halfwayThrough, arr.length);
Therefore, arrayFirstHalf is:
[1, 2, 3]
And arraySecondHalf is:
[4, 5, 6]
Conclusion
To splice a JavaScript array in half regardless of the size, we can use the slice method with the index of the middle element.
