Can i use a ternary operator instead of while loop

Question

I'm trying to reduce the while loop below to a single line

def this_method(week)
  i = 0
  while i < array.length
    yield(week[i])
    i += 1
  end
end

week.each do |week|
  puts week
end

Answer 1

Like others, I'm confused about the example (array is not defined, and this_method is never called). But you certainly don't need the while loop. I'd just use the Integer#times method, since you're making no use of the array values:

array.length.times {|i| yield week[i]}

#each_index (which ram suggested) works just as well.

But if array is actually meant to be week, then it gets even simpler:

week.each {|x| yield x}

I'm not sure why you'd want to create a method that just recycles #each though.

Answer 2

For since line you can use Array#each_index:

array.each_index {|i| yield week[i] }

Answer 3

No, you can't. The ternary operator is a conditional expression, the while is a loop expression.

However, in Ruby you normally use enumerators, not while. Your code can be rewritten as

def this_method(week)
  array.each_with_index { |item, i| yield(week[i]) }
end

What is not clear to me, is there the array variable comes from. Even in your example, there is no definition of such variable.

Answer 4

if in any form check conditions only once.
while on other hand, can check conditions many times.

Well, if you don't like other answers with enumerators you can use while in a different form:

def this_method(week)
  i = -1
  yield(week[i]) while (i+=1) < array.length
end