Alphabetic Counter Generator

alphabeticCounter.js

function* generateAlphabet() {
    // generate an increasing counter using letters ie a, b, c, ... z, za, zb, zc, etc
    // start at 'A'
    let charCode = 65;
    let pointer = 0;
    let lettersToYield = [];
    while (true) {
        const letter = String.fromCharCode(charCode);

        // assign this letter to the pointer array index 
        lettersToYield[pointer] = letter;
        charCode += 1

        // move the pointer right and reset back to 'A'
        if (letter === 'Z') {
          pointer += 1;
          charCode = 65;
        }

        // yield alphabet incremented string
        yield lettersToYield.join('')
    }
}

// usage example
// test out our alphabetic count generator fn
const aGen = generateAlphabet();
            
for (let i = 0; i < 55; i+=1) {
      const val = aGen.next().value;
      console.log('result', val)
}