JavaScript Program to Generate a Range of Numbers and Characters

// program to generate range of numbers and characters
function* iterate(a, b) {
  for (let i = a; i <= b; i += 1) {
    yield i
  }
}

function range(a, b) {
    if(typeof a === 'string') {
        let result = [...iterate(a.charCodeAt(), b.charCodeAt())].map(n => String.fromCharCode(n));
        console.log(result);
    }
    else {
        let result = [...iterate(a, b)];
        console.log(result);
    }
}

range(1, 5);
range('A', 'G');

Output

[1, 2, 3, 4, 5]
["A", "B", "C", "D", "E", "F", "G"]