Feature #5710
Enumerable#each( :method ) and Enumerable#map( :method )
| Status: | Closed | Start date: | 12/05/2011 | |
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assignee: | - | % Done: | 0% |
|
| Category: | core | |||
| Target version: | - |
Description
#each and #map could accept an argument of class string or symbol and send it to the objects in the enumerable.
An example:
array = [ "bi", "tri", "quad" ]
p array.each( :upcase! ) #=> [ "BI", "TRI", "QUAD" ]
p array.map( :length ) #=> [ 2, 3, 4 ]
It is the same --but succinctly-- as:
array.each { | string |
string.upcase!
}
array.map { | string |
string.length
}
This abbreviation is useful for those simple cases when you need to call a method over, or retrieve the values of a property of a set of objects.
History
Updated by trans (Thomas Sawyer) 6 months ago
Try
array = [ "bi", "tri", "quad" ]
p array.each( &:upcase! ) #=> [ "BI", "TRI", "QUAD" ]
p array.map( &:length ) #=> [ 2, 3, 4 ]
Updated by battox (Matías Battocchia) 6 months ago
It works. Thank you!
I guess that this issue has been resolved...
Updated by duerst (Martin Dürst) 6 months ago
- Status changed from Open to Closed
closed at request of submitter