Something like let in Ruby

Question

I used to write let-like expressions -- with lexical scope.

So I write my own (sad, but it will fail with multiple threads):

# Useful thing for replacing         


        

Answer 1

You can't specify the value that you want to initialize, but you can declare a variable as explicitly local to that block:

x = 'external value'
puts x
[1,2,3].each do |i; x|
  x = i
  puts x
end
puts x

This will result in:

external value
1
2
3
external value