JSFiddle - React, Tailwind, and code Playground

JavaScript

let arr = [1,2,3,4]

function chunk(arr, size) {
	let chunks = []
  
  for (let i = 0; i < arr.length; i += size) {
  	chunks.push([arr.slice(i, i + size)])
  }
  
  console.log(chunks)
}

console.log(chunk(arr, 5))