# 11 why doesn't x+= 10 not add 10 then 11 then 12 to the array?

#1

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<In what way does your code behave incorrectly? Include ALL error messages.>
I’m just trying to follow the logic of the below code.

• The code takes the numbers in the array 1,2,3,4,5 and then applies x += 10 to it. When you run the code the result is 1112131415

So this code has added 10 to each number in the array, however i would have expected this code to be actually x + 10. I would have thought x += 10 would act like a counter and so increase 10 by 1 each time and therefore would add 10 to the first number, then 11 to second number, 12 to the 3rd number etc resulting in 1113151719?

``````

array = [1,2,3,4,5]

array.each do |x|
x += 10
print "#{x}"
end

``````

#2

@benjsud,
Try using the code

``````array = [1,2,3,4,5]

array.each do |x|
print "#{x} => "
x += 10
print "#{x}\n"
end
``````

with each loop you iterate over the =array=
picking 1 Element-Value at each iteration
and `x += 10`
actually stands for `x = x + 10`