How this "for" loop is executed?

Question

Can someone explain what this does, step by step?
x = 0
for i in 2...4
x+=i
end
puts x

Answer 1

"For” loop from 2 to 3, therefore running two times.
# x=0
First loop: # i=2
x += 2 # x=2
Second loop: # i=3
x += 3 # x=5
puts x #x=5