Simple Array Generator

Here are a few different ways to create an array. So simple and fast.

Usage 1 (Lower Bottom)

Example: arraylower.js

const ARRAY_GEN = (x,y) => (function*(){
  while (x <= y) yield x++;
})();

for (let res of ARRAY_GEN(1,5)){
  console.log(res);
}

Output:

{
    "output": "
    1
    2
    3
    4
    5
    "
}

Usage 2 (Side by Side)

Example: arraysidebyside.js

const ARRAY_GEN = (x,y) => Array.from((function*(){
  while (x <= y) yield x++;
})());

console.log(ARRAY_GEN(1,5));

Output:

{
    "output": "[1, 2, 3, 4, 5]"
}

Usage 3 (Letters)

Example: arrayletters.js

function range(s, e, str){
  function *gen(s, e, str){
    while(s <= e){
      yield (!str) ? s : str[s]
      s++
    }
  }
  if (typeof s === 'string' && !str)
    str = 'abcdefghijklmnopqrstuvwxyz'
  const from = (!str) ? s : str.indexOf(s)
  const to = (!str) ? e : str.indexOf(e)
  // Return fonction.
  return [...gen(from, to, str)]
}

// console.log(range('a', 'e'))
// For Lowercase
// [ 'a', 'b', 'c', 'd', 'e' ]


// console.log(range('a', 'e').map(v=>v.to.reverse())
// For Lowercase and Reverse
// [ 'e', 'd', 'c', 'b', 'a' ]


// console.log(range('a', 'e').map(v=>v.toUpperCase()))
// For Uppercase
// [ 'A', 'B', 'C', 'D', 'E' ]


// console.log(range('a', 'e').map(v=>v.toUpperCase()).reverse())
// For Uppercase and Reverse
// [ 'E', 'D', 'C', 'B', 'A' ]