---
title: "Ruby 2.6 adds Enumerable#filter as alias of Enumerable#select"
description: "Ruby 2.6 adds Enumerable#filter as an alias of Enumerable#select"
canonical_url: "https://www.bigbinary.com/blog/ruby-2-6-adds-enumerable-filter-as-an-alias-of-enumerable-select"
markdown_url: "https://www.bigbinary.com/blog/ruby-2-6-adds-enumerable-filter-as-an-alias-of-enumerable-select.md"
---

# Ruby 2.6 adds Enumerable#filter as alias of Enumerable#select

Ruby 2.6 adds Enumerable#filter as an alias of Enumerable#select

- Author: Amit Choudhary
- Published: August 28, 2018
- Categories: Ruby 2.6, Ruby

Ruby 2.6 has added `Enumerable#filter` as an alias of `Enumerable#select`. The
reason for adding `Enumerable#filter` as an alias is to make it easier for
people coming from other languages to use Ruby. A lot of other languages,
including Java, R, PHP etc., have a filter method to filter/select records based
on a condition.

Let's take an example in which we have to select/filter all numbers which are
divisible by 5 from a range.

#### Ruby 2.5

```ruby
irb> (1..100).select { |num| num % 5 == 0 }
=> [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100]

irb> (1..100).filter { |num| num % 5 == 0 }
=> Traceback (most recent call last):
2: from /Users/amit/.rvm/rubies/ruby-2.5.1/bin/irb:11:in `<main>' 1: from (irb):2 NoMethodError (undefined method`filter' for 1..100:Range)
```

#### Ruby 2.6.0-preview2

```ruby
irb> (1..100).select { |num| num % 5 == 0 }
=> [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100]

irb> (1..100).filter { |num| num % 5 == 0 }
=> [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100]
```

Also note, along with `Enumerable#filter`, `Enumerable#filter!`,
`Enumerable#select!` was also added as an alias.

Here is the relevant [commit](https://github.com/ruby/ruby/commit/b1a8c64483)
and [discussion](https://bugs.ruby-lang.org/issues/13784).

## Links

- [Human page](https://www.bigbinary.com/blog/ruby-2-6-adds-enumerable-filter-as-an-alias-of-enumerable-select)