Javascript array chunking examples

array_chunk_examples.js

const sample_array = [...Array(100)].map((v,i)=>i);
const chunk_size = 10;

// reuseable reducer: non-destructive
const reduce_array_chunks = (size) => ((chunks, val, i)=> {
  if (i % size) { chunks[Math.floor(i / size)].push(val); } else chunks.push([val]);
  return chunks;
});
const chunk_reducer = reduce_array_chunks(chunk_size);  // reusable function option
const chunked_by_reduce = sample_array.reduce(chunk_reducer, []);

// single line: non-destructive
const chunked_by_map_pure = [...Array(Math.ceil(sample_array.length / chunk_size))].map(_ => sample_array.slice(0,chunk_size));

// single line: empties original array
const chunked_by_map_destructive = [...Array(Math.ceil(sample_array.length / chunk_size))].map(_ => sample_array.splice(0,chunk_size));