Change value of array element which is being referenced in a .each loop?

Question

How do I get the following to happen: I want to change the value of an array element which is being referenced between pipe characters in a .each loop.

Answer 1

x = %w(hello there world)
x[index] = "hi" if index = x.index("hello")
x[index] = "hi" if index

or

x = %w(hello there world)
index = x.index("hello") and x[index] = "hi"

But one notice: it will replace only first match. Otherwise use map! as @SirDarlus suggested

Also you can use each_with_index

x.each_with_index do |element, index|
  x[index] = "hi" if element == "hello" # or x[index].replace("hi") if element == "hello"
end

But I still prefer using map! :)