@extra-array/index-range/index.js

Gets index range of part of array.

'use strict';
function index(x, i = 0) {
    return i < 0 ? Math.max(x.length + i, 0) : Math.min(i, x.length);
}
function indexRange(x, i = 0, I = x.length) {
    i = index(x, i);
    I = Math.max(i, index(x, I));
    return [i, I];
}
module.exports = indexRange;