Style/HashSyntax-20230503233307

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Style/HashSyntax

Safe autocorrect: Yes
✅ The autocorrect a cop does is safe (equivalent) by design.

Description

Overview

Checks hash literal syntax.

It can enforce either the use of the class hash rocket syntax or
the use of the newer Ruby 1.9 syntax (when applicable).

A separate offense is registered for each problematic pair.

The supported styles are:

• ruby19 - forces use of the 1.9 syntax (e.g. {a: 1}) when hashes have
  all symbols for keys
• hash_rockets - forces use of hash rockets for all hashes
• no_mixed_keys - simply checks for hashes with mixed syntaxes
• ruby19_no_mixed_keys - forces use of ruby 1.9 syntax and forbids mixed
  syntax hashes

This cop has EnforcedShorthandSyntax option.
It can enforce either the use of the explicit hash value syntax or
the use of Ruby 3.1's hash value shorthand syntax.

The supported styles are:

• always - forces use of the 3.1 syntax (e.g. {foo:})
• never - forces use of explicit hash literal value
• either - accepts both shorthand and explicit use of hash literal value
• consistent - forces use of the 3.1 syntax only if all values can be omitted in the hash

Examples

EnforcedStyle: ruby19 (default)

# bad
{:a => 2}
{b: 1, :c => 2}

# good
{a: 2, b: 1}
{:c => 2, 'd' => 2} # acceptable since 'd' isn't a symbol
{d: 1, 'e' => 2} # technically not forbidden

EnforcedStyle: hash_rockets

# bad
{a: 1, b: 2}
{c: 1, 'd' => 5}

# good
{:a => 1, :b => 2}

EnforcedStyle: no_mixed_keys

# bad
{:a => 1, b: 2}
{c: 1, 'd' => 2}

# good
{:a => 1, :b => 2}
{c: 1, d: 2}

EnforcedStyle: ruby19_no_mixed_keys

# bad
{:a => 1, :b => 2}
{c: 2, 'd' => 3} # should just use hash rockets

# good
{a: 1, b: 2}
{:c => 3, 'd' => 4}

EnforcedShorthandSyntax: always (default)

# bad
{foo: foo, bar: bar}

# good
{foo:, bar:}

EnforcedShorthandSyntax: never

# bad
{foo:, bar:}

# good
{foo: foo, bar: bar}

EnforcedShorthandSyntax: either

# good
{foo: foo, bar: bar}

# good
{foo: foo, bar:}

# good
{foo:, bar:}

EnforcedShorthandSyntax: consistent

# bad - `foo` and `bar` values can be omitted
{foo: foo, bar: bar}

# bad - `bar` value can be omitted
{foo:, bar: bar}

# bad - mixed syntaxes
{foo:, bar: baz}

# good
{foo:, bar:}

# good - can't omit `baz`
{foo: foo, bar: baz}

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