number-literal-case.md

Enforce proper case for numeric literals

💼 This rule is enabled in the ✅ recommended config.

🔧 This rule is automatically fixable by the --fix CLI option.

Differentiating the casing of the identifier and value clearly separates them and makes your code more readable.

• Lowercase identifier and uppercase value for Number and BigInt.
• Lowercase e for exponential notation.

Fail

Hexadecimal

const foo = 0XFF;
const foo = 0xff;
const foo = 0Xff;
const foo = 0Xffn;

Binary

const foo = 0B10;
const foo = 0B10n;

Octal

const foo = 0O76;
const foo = 0O76n;

Exponential notation

const foo = 2E-5;

Pass

const foo = 0xFF;

const foo = 0b10;

const foo = 0o76;

const foo = 0xFFn;

const foo = 2e+5;