Issue #17153 has been updated by jnchito (Junichi Ito).


Oops! I didn't notice that. Thank you for letting me know. Please close this.

sawa (Tsuyoshi Sawada) wrote in #note-1:
> Hi Ito-san,
> 
> This is a duplicate of https://bugs.ruby-lang.org/issues/5663 and https://bugs.ruby-lang.org/issues/15323, and has been realized as `Enumerable#filter_map` since Ruby 2.7.0.
> 
> ```ruby
> [1, 2, 3, 4, 5].filter_map { |n| n * 10 if n.even? }
> #=> [20, 40]
> ```



----------------------------------------
Feature #17153: Add Enumerable#compact_map
https://bugs.ruby-lang.org/issues/17153#change-87468

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
----------------------------------------
I often write code like this (`map`, then `compact`):

``` ruby
nums = [1, 2, 3, 4, 5]
nums.map { |n| n * 10 if n.even? }.compact
#=> [20, 40]
```

Or like this:

``` ruby
nums.select(&:even?).map { |n| n * 10 }
#=> [20, 40]
```

I think it would be very useful and simpler if we could do it by calling one method:

``` ruby
nums.compact_map { |n| n * 10 if n.even? }
#=> [20, 40]
```

How about introducing `Enumerable#compact_map` ?




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