index (original) (raw)
Get zero-based index for an element in array.
Similar: index, indexRange, size, isEmpty.
function index(x, i) // x: an array // i: ±index
const xarray = require('extra-array');
var x = [2, 4, 6, 8]; xarray.index(x, 1); // → 1
xarray.index(x, -1); // → 3
xarray.index(x, -10); // → 0