Style-NumericLiteralPrefix.md

Pattern: Malformed numeric literal prefix

Issue: -

Description

This rule checks for octal, hex, binary and decimal literals using uppercase prefixes and corrects them to lowercase prefix or no prefix (in case of decimals). E.g. for octal use 0o instead of 0 or 0O.

Can be configured to use 0 only for octal literals using EnforcedOctalStyle => zero_only

Examples

# bad
num = 01234
num = 0O1234
num = 0X12AB
num = 0B10101
num = 0D1234
num = 0d1234

# good - easier to separate digits from the prefix
num = 0o1234
num = 0x12AB
num = 0b10101
num = 1234

Default configuration

Attribute	Value
EnforcedOctalStyle	zero_with_o
SupportedOctalStyles	zero_with_o, zero_only

Further Reading

• RuboCop - Style/NumericLiteralPrefix
• https://github.com/bbatsov/ruby-style-guide#numeric-literal-prefixes