Ok, so I have an array:
numbers = ["2", "3", "4", "5"]
and I need to split the array into two arrays with a conditional
numbers.reject!{|x| x > 4 }
and what i need is one array numbers to contain numbers = ["5"] and another array with the rejects rejects = ["2", "3", "4"]
How do I do this? ...It seems so easy with a loop but is there a way to do this in a one liner?
Check out Enumerable#partition
arr = ["2", "3", "4", "5"]
numbers, rejects = arr.partition{ |x| x.to_i > 4 }
# numbers = ["5"]
# rejects = ["2", "3", "4"]
numbers = [2, 3, 4, 5]
n_gt_four = numbers.select{|n| n > 4}
n_all_else = numbers - n_gt_four
puts "Original array: " + numbers.join(", ")
puts "Numbers > 4: " + n_gt_four.join(", ")
puts "All else: " + n_all_else.join(", ")
Outputs:
Original array: 2, 3, 4, 5 Numbers > 4: 5 All else: 2, 3, 4
n_gt_four = numbers.select(&4.method(:<)). ;-)