indexRange

Gets index range of part of iterable.

Similar: index, indexRange, length.

iterable.indexRange(x, i, I);
// x: an iterable
// i: start index (-ve: from right) (0)
// I: end index (-ve: from right) (end)
// --> [start index, end index]

const iterable = require('extra-iterable');

var x = [2, 4, 6, 8];
iterable.indexRange(x, 1);
// [1, 4]

iterable.indexRange(x, 1, -1);
// [1, 3]

iterable.indexRange(x, 1, -10);
// [1, 1]

references

• Array.prototype.slice(): MDN web docs