Loops and itterators

Question 1

how does the while loop look like?

Answer 1

i = 0

while i

Question 2

how does the until loop look like?

Answer 2

i = 0
until i > 10
  print i
  i = i + 1
end

Question 3

how can you refactor this code i = i + 1 ?

Answer 3

i += 1

and it can be used with i -=1 and i *= 2 as well.

Question 4

how does the for loop look like?

Answer 4

for num in 1..10
puts num
end

Question 5

what is the different between 1..10 and 1…10 ?

Answer 5

the …&raquo_space; does not include the last object in the range

the ..&raquo_space; includes the last object in the range

Question 6

how do you refactor a do end block?

Answer 6

{ } are used interchangeably for the do end block.

Question 7

how does a loop iterator look like? and how to stop a loop?

Answer 7

i = 0
loop do 
  i += 1
  puts i
  break if i > 20
end

Question 8

how to skip steps in a loop?

Answer 8

for i in 1..5
next if i % 2 == 0
print i
end

Question 9

how does the each iterator look like?

Answer 9

object.each do |item| 
  #do something
end

object.each { |item| #do something }

Question 10

how does the times iterator look like?

Answer 10

10.times { #do something }

Question 11

a method that takes a string and returns an array.

Answer 11

split
“I am the guru”.split(“ “)
» [“I”, “am”, “the”, “guru”]