length

Gets length of part of iterable.

Similar: index, indexRange, length.

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

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

var x = [2, 4, 6, 8];
iterable.length(x, 1);
// 3

iterable.length(x, 1, -1);
// 2

iterable.length(x, 1, -10);
// 0

references

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