javascript - Why are Octal numeric literals not allowed in strict mode (and what is the workaround?)

Question

Why are Octal numeric literals not allowed in JavaScript strict mode? What is the harm?

"use strict";
var x = 010; //Uncaught SyntaxError: Octal literals are not allowed in strict mode.

<h1>Check browser console for errors</h1>

Answer 1

Octal literals are not allowed because disallowing them discourages programmers from using leading zeros as padding in a script. For example, look at the following snippet:

var eight = 0008,
    nine = 00009,
    ten = 000010,
    eleven = 011;

console.log(eight, nine, ten, eleven);