String Chunker

StringChunker.js

 function chunkString (str, len) {
  const size = Math.ceil(str.length/len)
  const r = Array(size)
  let offset = 0
  
  for (let i = 0; i < size; i++) {
    r[i] = str.substr(offset, len)
    offset += len
  }
  
  return r
}

// console.log(chunkString("helloworld", 3))
// => [ "hel", "low", "orl", "d" ]

// 10,000 char string
// const bigString = "helloworld".repeat(1000)
// console.time("perf")
// const result = chunkString(bigString, 3)
// console.timeEnd("perf")
// console.log(result)
// => perf: 0.385 ms
// => [ "hel", "low", "orl", "dhe", "llo", "wor", ... ]