no-let.md

Forbid the use of let

If you want to program as if your variables are immutable, part of the answer is to not allow your variables to be reassigned. By not allowing the use of let and var, variables that you declared may not be reassigned.

This rule does not forbid the use the use of var, but you should forbid that by turning on the no-var core rule.

Fail

let a = 1;
let b = 2,
    c = 3;
let d;

Pass

const a = 1;
const b = 2,
      c = 3;