index

Gets zero-based index. 🏃 📼 📦 🌔

Similar: index, indexRange, length.

iterable.index(x, [i]);
// x: an iterable
// i: index (-ve: from right) (0)

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

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

iterable.index(x, -1);
// 3

iterable.index(x, -10);
// 0

references

• Array.prototype.slice: MDN web docs