Slice a string by given chunk sizes

sliceBy.js

function sliceBy(str, [ chunkSize = -1, ...rest ] = []) {  
  // Guard against infinite recursion 
  if (chunkSize < 1) {
    return [str]
  }
  
  if (str.length <= chunkSize) {
    return [str]
  }
  
  return [
    str.slice(0, chunkSize),
    ...sliceBy(str.slice(chunkSize), rest)
  ]
}

sliceBy('371449635398431', [4, 6, 5]).join(' ')
// 3714 496353 98431