Ruby Call by reference is not working in each function?

excluded = "a", " an", " the", " at", " in", " on ", "since"     
temp = excluded.split(",").each {|val|  val = val.strip}

But I am getting the same array. Its not striping. I need to do t开发者_JAVA百科his in single line

i need the output in temp like ["a", "an", "the", "at", "in", "on", "since"]

try this

 temp =  ["a", " an", " the", " at", " in", " on ", "since"].map(&:strip)

As you can see from the docs Array#each returns the original receiver (ary.each {|item| block } → ary). What you want — as others have already pointed out — is Array#map.

Also your current code should raise a NoMethodError because of calling split on an array. Assuming that excluded is a string, the following will work:

excluded.split(",").map(&:strip) #=> ["a", "an", "the", "at", "in", "on", "since"]

Instead of using strip you can also just change what you split on:

excluded.split(/,\s*/) #=> ["a", "an", "the", "at", "in", "on", "since"]

You want this?:

excluded = ["a", " an", " the", " at", " in", " on ", "since"]
stripped_excluded = excluded.collect{ |i| i.strip }

or shortcut:

stripped_excluded = excluded.collect(&:strip)

I think this should be the easier way:

temp = excluded.map(&:strip)
p temp