group (original) (raw)
Keep similar values together and in order.
function group(x, fc, fm) // x: an array // fc: compare function (a, b) // fm: map function (v, i, x)
const xarray = require('extra-array');
var x = [1, 2, 2, -2, -2, 4]; xarray.group(x); // → [ [ 1 ], [ 2, 2 ], [ -2, -2 ], [ 4 ] ]
xarray.group(x, (a, b) => Math.abs(a) - Math.abs(b)); // → [ [ 1 ], [ 2, 2, -2, -2 ], [ 4 ] ]
xarray.group(x, null, v => Math.abs(v)); // → [ [ 1 ], [ 2, 2, -2, -2 ], [ 4 ] ]