hd-utils/lib/utils/array/arrayRange.js

A handy utils for modern JS developers

/**
 * @description It takes two arguments, a and b, and returns an array of numbers or letters from a to b
 * @example arrayRange(1,5) => [ 1, 2, 3, 4, 5 ]
 * @example arrayRange("a", "c") => ["a", "b", "c"]
 * @param {Key} a - The starting point of the array.
 * @param {Key} b - The ending value of the range.
 * @param {number} step - The step value.
 * @returns An array of strings.
 */
export default function arrayRange(a, b, step) {
    let A = [];
    if (typeof a == 'number' && typeof b == 'number') {
        A[0] = a;
        step = step || 1;
        while (a + step <= b) {
            A[A.length] = a += step;
        }
    }
    else if (typeof a == 'string' && typeof b == 'string') {
        var s = 'abcdefghijklmnopqrstuvwxyz';
        if (a === a.toUpperCase()) {
            b = b.toUpperCase();
            s = s.toUpperCase();
        }
        s = s.substring(s.indexOf(a), s.indexOf(b) + 1);
        A = s.split('');
    }
    return A;
}