flat

Flattens nested iterable to given depth.

iterable.flat(x, [dep]);
// x:   a nested iterable
// dep: maximum depth (-1)

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

var x = [[1, 2], [3, [4, [5]]]];
iterable.flat(x);
// [1, 2, 3, 4, 5]

iterable.flat(x, 1);
// [1, 2, 3, [4, [5]]]

iterable.flat(x, 2);
// [1, 2, 3, 4, [5]]

references

• iterable.prototype.flat(): MDN web docs
• _.flatten(): lodash