Versions

no-octal

Disallow octal literals

✅ Recommended

Using the recommended config from @eslint/js in a configuration file enables this rule

Octal literals are numerals that begin with a leading zero, such as:

var num = 071;      // 57

Because the leading zero which identifies an octal literal has been a source of confusion and error in JavaScript code, ECMAScript 5 deprecates the use of octal numeric literals.

Rule Details

The rule disallows octal literals.

If ESLint parses code in strict mode, the parser (instead of this rule) reports the error.

Examples of incorrect code for this rule:

Open in Playground
/*eslint no-octal: "error"*/

var num = 071;
var result = 5 + 07;

Examples of correct code for this rule:

Open in Playground
/*eslint no-octal: "error"*/

var num  = "071";

Compatibility

  • JSHint: W115

Version

This rule was introduced in ESLint v0.0.6.

Resources

Change Language