Feature #17663
Updated by RichOrElse (Ritchie Buitre) over 3 years ago
**Enumerator#with** yields each element along with the arguments
``` ruby
class Enumerator
def with(*options)
return to_enum(:with, *options) unless defined? yield
each do |entry|
yield entry, *options
end
end
end
```
I found **Enumerator#with_object** method awkward to use. Suppose we have a proc that accepts more than 1 argument.
``` ruby
format = proc do |value, *option|
value.to_s(*option)
end
```
Normally to apply the argument we enclosed it in a block, like so:
``` ruby
(10..15).map { |n| format.(n, 16) } # => ["a", "b", "c", "d", "e", "f"]
```
Here's the equivalent code using **Enumerator#with_object** method.
``` ruby
(10..15).each.with_object(16).map(&format) # => ["a", "b", "c", "d", "e", "f"]
```
Tried simplifying this code further, but **Enumerator#with_object** ** Enumerator#with_object** ignores the given block and just returns the argument.
``` ruby
(10..15).map.with_object(16, &format) # => 16
```
Compare to how concise this line using the **Enumerator#with**
``` ruby
(10..15).map.with(16, &format) # => ["a", "b", "c", "d", "e", "f"]
```