I'm using an .each loop to iterate over an array. I want to change elements in this array, so I tried something like this:
ex = ["el01", "el02", "el03", "el04"]
ex.each do |el|
if (el == "el02")
el = "changed"
end
end
puts ex
but it seems don't works! It puts me :
el01
el02
el03
el04
I want to know what I did wrong! or if it can't be done this way, how to do it.
You should use each:
ex = ["el01", "el02", "el03", "el04"]
ex.each do |str|
# do with str, e.g., printing each element:
puts str
end
Using for in Ruby is not recommended, as it simply calls each and it does not introduce a new scope.
However, if your intent is to change each element in the array, you should use map:
ex = ["el01", "el02", "el03", "el04"]
ex.map do |str|
str.upcase
end
#=> ["EL01", "EL02", "EL03", "EL04"]
You can do that like this:
for item in ex
#do something with the item here
puts item
end
A more Ruby idiomatic way to do it is:
ex.each do |item|
#do something with the item here
puts item
end
Or, you can do it in one line:
ex.each {|item| puts item}
The ruby way is to use the #each method of lists. And several other classes have #each, too, like Ranges. Therefore you will almost never see a for loop in ruby.
.mapthat I didn't know before, can you please vote-it up ? I can no longer ask questions in stackoverflow because of this question.