Feature #5710: Enumerable#each( :method ) and Enumerable#map( :method )

• Status: Closed
• Assignee: -
• Target version: -

[battox (Matías Battocchia)]

#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.

[trans (Thomas Sawyer)]

Try

array = [ "bi", "tri", "quad" ]
p array.each( &:upcase! ) #=> [ "BI", "TRI", "QUAD" ]
p array.map( &:length ) #=> [ 2, 3, 4 ]

[battox (Matías Battocchia)]

It works. Thank you!

I guess that this issue has been resolved...

[duerst (Martin Dürst)]

• Status changed from Open to Closed

closed at request of submitter