Generate a random char between a and z in JavaScript

If you want to get a random char between a and z in JavaScript:

javascript
let abc = 'abcdefghijklmnopqrstuvwxyz';
let ran = ~~(26 * Math.random());
let a_z = abc[ran];

In one line of code:

javascript
let a_z = 'abcdefghijklmnopqrstuvwxyz'[~~(26 * Math.random())];

Alternatively, for uppercase:

javascript
let A_Z = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'[~~(26 * Math.random())];