chunk

Break map into chunks of given size.

function chunk(x, n, s)
// x: a map
// n: chunk size [1]
// s: chunk step [n]

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

var x = new Map([
  ['a', 1], ['b', 2], ['c', 3], ['d', 4],
  ['e', 5], ['f', 6], ['g', 7], ['h', 8]
]);
map.chunk(x, 3);
// → [
// →   Map(3) { 'a' => 1, 'b' => 2, 'c' => 3 },
// →   Map(3) { 'd' => 4, 'e' => 5, 'f' => 6 },
// →   Map(2) { 'g' => 7, 'h' => 8 }
// → ]

map.chunk(x, 2, 3);
// → [
// →   Map(2) { 'a' => 1, 'b' => 2 },
// →   Map(2) { 'd' => 4, 'e' => 5 },
// →   Map(2) { 'g' => 7, 'h' => 8 }
// → ]

map.chunk(x, 4, 3);
// → [
// →   Map(4) { 'a' => 1, 'b' => 2, 'c' => 3, 'd' => 4 },
// →   Map(4) { 'd' => 4, 'e' => 5, 'f' => 6, 'g' => 7 },
// →   Map(2) { 'g' => 7, 'h' => 8 }
// → ]

References

• List-Extra.groupsOf: elm
• iterable_chunk: PHP
• array_chunk: PHP
• str_split: PHP
• numpy.split: Python
• _.chunk: lodash
• Array.inGroupsOf: sugarjs
• Array.inGroups: sugarjs
• even-chunks: @addaleax
• chunk: @ryancole
• iterable.chunk: @zhiyelee
• chunk-iterable: @haio