CODEWITHSUNDEEP
javascriptecmascript-6babeljsoctal
Ionică Bizău
Ionică Bizău

Reputation: 113335

Octal numbers in babel

I'm playing with babel-cli. I installed the ES2015 extension and it works well. For example, the following snippet:

let square = x => x * x;

...is converted into:

"use strict";

var square = function square(x) {
  return x * x;
};

However I have trouble when using octal numbers. For example:

let mode = 0777;

throws me an error:

SyntaxError: index.js: Invalid number (1:11)
> 1 | let mode = 0777;
    |            ^

  2 |

It looks like it doesn't like the numbers starting with 0 (octal numbers). How can I solve this?

In fact, such numbers appear not in my code but in one of the dependencies.

Is it a babel bug or a feature? What is the workaround/solution?

Upvotes: 3

Views: 918

Answers (1)

Ammar Hasan
Ammar Hasan

Reputation: 2516

you are doing it incorrectly, it should be like let mode = 0o777;, notice the o between 0 and 777

ES6 documentation here: Binary and Octal Literals

// try this in chrome
document.write(0o777);

Upvotes: 3

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