// Created on savesnippets.com · https://savesnippets.com/bn3uxWKRROHqx7
function chunk(array, size) {
  const chunks = [];
  for (let i = 0; i < array.length; i += size) {
    chunks.push(array.slice(i, i + size));
  }
  return chunks;
}

// Usage
const items = [1, 2, 3, 4, 5, 6, 7];
console.log(chunk(items, 3));
// [[1,2,3], [4,5,6], [7]]