indexRange (original) (raw)
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 ]