[ruby-core:94366] [Ruby master Feature#16104] Introduce merge_if and merge_if!

Issue #16104 has been updated by janfri (Jan Friedrich).


akash (Akash Gupta) wrote:
> The method `merge_if` / `merge_if!` will merge the passed hash in parameter only if the block evaluates to true, otherwise not. Similar to `count` method with a block.

What if the callee has more than one entry? For example

```ruby
a = {a: 'Apple', c: 'Pear'}
a.merge_if(b: 'Ball') {|k, v| v == 'Apple'}
# => ???
```

The block is called twice and evaluates one time `true` and the other `false`.

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Feature #16104: Introduce merge_if and merge_if!
https://bugs.ruby-lang.org/issues/16104#change-80777

* Author: akash (Akash Gupta)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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The method `merge_if` / `merge_if` will merge the passed hash in parameter only if the block evaluates to true, otherwise not. Similar to `count` method with a block.



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