Style-NegatedIf.md

Pattern: if with negated condition

Issue: -

Description

Checks for uses of if with a negated condition. Only ifs without else are considered. There are three different styles:

• both
• prefix
• postfix

Examples

# EnforcedStyle: both
# enforces `unless` for `prefix` and `postfix` conditionals

# good

unless foo
  bar
end

# bad

if !foo
  bar
end

# good

bar unless foo

# bad

bar if !foo

# EnforcedStyle: prefix
# enforces `unless` for just `prefix` conditionals

# good

unless foo
  bar
end

# bad

if !foo
  bar
end

# good

bar if !foo

# EnforcedStyle: postfix
# enforces `unless` for just `postfix` conditionals

# good

bar unless foo

# bad

bar if !foo

# good

if !foo
  bar
end

Default configuration

Attribute	Value
EnforcedStyle	both
SupportedStyles	both, prefix, postfix

Further Reading

• RuboCop - Style/NegatedIf
• https://github.com/bbatsov/ruby-style-guide#unless-for-negatives