flatmap-fast

The fastest flatMap this side of node.

Takes two arguments:

1. An array.
2. A callback function (optional).

const flatMap = require("flatmap-fast");

const arrNum = [[], [1], [2, 3]];

flatMap(arrNum);

// => [ 1, 2, 3 ]

flatMap(arrNum, (i) => {
  return i + i;
});

// => [ 2, 4, 6 ]

const arrLet = [
  [],
  ['a'],
  ['b', 'c']
];

flatMap(arrLet);

// => [ 'a', 'b', 'c' ]

Run npm test to test this flatMap against other algorithms.

$ npm test

> flatmap-fast@2.0.2 test /home/ry/flatmap-fast
> node --harmony test.js

flatMapFast took: 417
[ 2, 4, 6 ]
[ 'a', 'b', 'c' ]
flatMapConcatApply took: 1331
[ 2, 4, 6 ]
[ 'a', 'b', 'c' ]
flatMapConcatRest took: 1230
[ 2, 4, 6 ]
flatMapApplyBind took: 2637
[ 2, 4, 6 ]
[ 'a', 'b', 'c' ]
flatmapjs took: 1272
[ '', '11', '2,32,3' ]
[ 'a', 'b', 'c' ]