Check If Any Number in a Ruby Array Is Greater Than or Equal to 100

From a basic point of view you can do with your Array ary:

a nice old plain for:

ret = false
for i in 0...(ary.size)
  if ary[i] >= 100
    ret = true
    break
  end
end

or you can use a while

ret = false
i = 0
while not ret or i < ary.size
  ret = ary[i] >= 100
  i += 1
end

or you can use an each method on the array:

ret = false
ary.each do |el|
  ret = true if el >= 100
end

or you can use any? like in @Philip answer

or you can use the max method, as cleverly suggested by @sagar-pandya (this solution is extremely nice, but requires to traverse the whole array):

ary.max >= 100

or you can map your array on a newer array of boolean (but this requires two loops over two arrays, thus it is not as efficient as other solutions), and then inject the result in a new variable with the result:

bol = ary.map { |el| el >= 100 }
ret = bol.inject { |s, el| s or el }

or you can use directly inject (but this time you have to set initial conditions):

ret = ary.inject(false) { |s, el| s or (el >= 100) }

Chose your weapon :). But if you want to do it right think about (given your specific task):

• using a method that traverse the array only once;
• using a method that stops when it has found a true condition.