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

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

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
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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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