Metadata

ID: ruby-best-practices/reverse-each

Language: Ruby

Severity: Notice

Category: Best Practices

Description

The rule “Prefer using reverse_each” is based on the principle of optimizing your Ruby code for better performance. In Ruby, there are two main methods for iterating over the elements of an array in reverse order: reverse.each and reverse_each. While the functionality of these two methods is the same, their performance characteristics are different.

The reverse.each method creates a new array that is the reverse of the original before performing the iteration. This can lead to unnecessary memory usage, especially for large arrays, and slow down the performance of your code.

On the other hand, the reverse_each method does not create a new array. Instead, it starts from the end of the original array and works its way to the beginning, saving memory and enhancing performance.

Therefore, to adhere to good coding practices and ensure optimal performance, it is recommended to use reverse_each instead of reverse.each when you need to iterate over the elements of an array in reverse order.

Non-Compliant Code Examples

array.reverse.each { }

["foo", "bar"].reverse.each { }

Compliant Code Examples

array.reverse_each { }

["foo", "bar"].reverse_each { }

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