indexRange - nodef/extra-array GitHub Wiki
Get zero-based index range for part of array.
Similar: index, indexRange, size, isEmpty.
function indexRange(x, i, I)
// x: an array
// i: begin ±index [0]
// I: end ±index (exclusive) [|x|]
const xarray = require('extra-array');
var x = [2, 4, 6, 8];
xarray.indexRange(x, 1);
// → [ 1, 4 ]
xarray.indexRange(x, 1, -1);
// → [ 1, 3 ]
xarray.indexRange(x, 1, -10);
// → [ 1, 1 ]