group

Keeps similar values together and in order.

Alternatives: compare, map.

iterable.group(x, [fn]);
// x:  an iterable
// fn: compare function (a, b)

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

var x = [1, 2, 2, -2, -2, 4];
iterable.group(x);
// [[1], [2, 2], [-2, -2], [4]]

iterable.group(x, (a, b) => Math.abs(a) - Math.abs(b));
// [[1], [2, 2, -2, -2], [4]]

references

• Data.List.groupBy(): Haskell
• List-Extra.group(): elm
• List-Extra.groupWhile(): elm