each method

[Amir Ebrahimifard]

Hi
What can I do to can apply some change to an array for always ? ( I want
to use iterator and each method and apply some change in an array )

 

[Maurizio De Santis]

Hi
What can I do to can apply some change to an array for always ? ( I want
to use iterator and each method and apply some change in an array )

if I understood the question:

array.collect! {|item| block } → array
array.map! {|item| block } → array

Invokes the block once for each element of self, replacing the element
with the value returned by block. See also Enumerable#collect.

a = [ "a", "b", "c", "d" ]
a.collect! {|x| x + "!" }
a #=> [ "a!", "b!", "c!", "d!" ]

 

[Brian Candler]

Hi
What can I do to can apply some change to an array for always ? ( I want
to use iterator and each method and apply some change in an array )

if I understood the question:

array.collect! {|item| block } → array
array.map! {|item| block } → array

Invokes the block once for each element of self, replacing the element
with the value returned by block. See also Enumerable#collect.

a = [ "a", "b", "c", "d" ]
a.collect! {|x| x + "!" }
a #=> [ "a!", "b!", "c!", "d!" ]

Another option, if you know the contents are all Strings or Arrays, is
to use replace:

a.each { |x| x.replace(x+"!") }

It's different because it modifies the string objects themselves
(leaving the Array pointing to the same string objects)