The rule “Prefer using Array join” advises the use of the join method over the * operator when combining elements of an array into a string. This is because the join method is specifically designed for this purpose and its use makes the code more readable and self-explanatory.
The importance of this rule lies in code clarity and maintainability. When other developers read your code, the join method clearly communicates that you are combining elements of an array into a string. On the other hand, the * operator can be confusing because it is also used for multiplication and repetition operations.
To comply with this rule, always use the join method when your intention is to combine elements of an array into a string. For example, instead of writing %w[foo bar baz] * ', ', write %w[foo bar baz].join(', '). This change makes the code more readable and less prone to misunderstandings.
Non-Compliant Code Examples
%w[foo bar baz]*', '# => 'foo, bar, baz'
Compliant Code Examples
%w[foo bar baz].join(', ')# => 'foo, bar, baz'
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How to use this rule
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rulesets:- ruby-code-style # Rules to enforce Ruby code style.
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