Question

I was wondering how to do the follow.

I have an array of objects and I’m trying to retrieve a set amount eg of them around a given index.

Here’s an example.

var arr = [0,1,2,3,4,5,6,7,8,9,10];
var index = 0;
var max = 5;

If the index is 0 I want [0 - 4]
If the index is 4 I want [2 - 6]
If the index is 9 I want [6 - 10]

But I also want it to work if the array is smaller then the max too. Eg

var arr = [0,1,2];
var index = 0;
var max = 5;

Any index would return [0 - 2]

Any thoughts?

Answer 1

You might want to try this

var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

function getRange(array, index, range) {
    var least = index - Math.floor(range/2);
    least = (least < 0) ? 0 : least;
    return array.slice(least, least+range);
}