I would like to compare two arrays and return the first value of array 1 that matches an item from array two. Here is what I have so far:
def find_the_color(array_1)
array_2 = ["red", "yellow", "blue"]
sample.find do |x|
x=="red"||x=="yellow"||x=="blue"
end
end
I would like to do this using the array instead of separating it into 3 conditional statements. Is there a way?
Simply do this
array_1.find { |x| array_2.include?(x) }
array_1 = [ 'green', 'yellow' ]
array_2 = ["red", "yellow", "blue"]
( array_1 & array_2 ).first
If performance is important, first convert array_2 to a Set:
array_1 = %w{ green yellow orange purple mauve black blue }
array_2 = %w{ pink red mauve white brown }
require 'set'
set_2 = array_2.to_set
array_1.find { |e| set_2.include? e }
#=> "mauve"
By converting array_2 to a set at the onset, set_2.include? e can be executed quickly (similar to looking up the value of a hash key). By contrast, with Array#include?, array_2 must be enumerated for each element of array_1 until a match is found.
