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Ruby Ruby Foundations Loops Creating Loops

Nicholas Lee
Nicholas Lee
12,474 Points
Posted by Nicholas Lee
Nicholas Lee
12,474 Points

Why is hello world not repeated? 

i = 0
string ="hello world"
while i <= 10
    string ="Hello world #{i}"
    puts "i is now #{i}"
    i += 1
end
puts "the final value of #{i}"
puts "The final value of #{string}"


What was the significance of having string ="Hello World #{i}" in the code?
Why does it not repeat?
Why does it not read Hello world 11?

Simple, but Jason just blew over it.

4 Answers

thomascawthorn
thomascawthorn
22,986 Points
thomascawthorn
thomascawthorn
22,986 Points

hey man,

  • I think the significance of Hello World #{i} is going to come apparent in the next video - it's to do with when the different loops stop/start running
  • It doesn't repeat because you're only change the value of 'string' not puts (put string-ing) it to the page.
  • Because you've stopped the loop of a condition of <= 10. Therefore i will never equal 11. if you put i +=1 at the beginning of the loop, before you redeclare string you would get Hello World 11.

On the last repetition of the loop you've given us, the value of i will be 11.

Nicholas Lee
Nicholas Lee
12,474 Points
Nicholas Lee
Nicholas Lee
12,474 Points

I also cannot seem to post the block code. excuse me while I figure that out.

Jim Withington
Jim Withington
12,025 Points
Jim Withington
Jim Withington
12,025 Points

Hey hey--

  1. To post your code, you can refer to this How-to Guide.

  2. It doesn't repeat in the same way that i did because you're only using one puts for Hello World.

If you did it this way instead, you'd get it to repeat. 

i = 0

string = "Hello World"

while i <= 10
    string = "Hello World #{i}"
    puts "i is now #{i}"
    puts "Hello World #{i}"
    i += 1
end

puts "The final value of i is #{i}"
puts "The final value of string is #{string}"

Hope that helps!

Brandon Mrsny
Brandon Mrsny
4,865 Points
Brandon Mrsny
Brandon Mrsny
4,865 Points

You are not += or incrementing "Hello World" you are only incrementing i with a += 1. So, you are really only incrementing i from 0 till it reaches or equals 10.