any all none find

Ruby Enumerables: 'any', 'all', 'none', and 'find'

Author: MuminjonGuru

HackerRank/Enumerable/enumerable_mixins.rb

@@ -0,0 +1,26 @@
+def func_any(hash)
+ # Check and return true if any key object within the hash is of the type Integer
+ # If not found, return false.
+ hash.any? { |k, i| k.is_a? Integer }
+end
+
+def func_all(hash)
+ # Check and return true if all the values within the hash are Integers and are < 10
+ # If not all values satisfy this, return false.
+ hash.all? { |k, v| v < 10 }
+end
+
+def func_none(hash)
+ # Check and return true if none of the values within the hash are nil
+ # If any value contains nil, return false.
+ hash.none? { |k, v| v == nil }
+end
+
+def func_find(hash)
+ # Check and return the first object that satisfies either of the following properties:
+ # 1. There is a [key, value] pair where the key and value are both Integers and the value is < 20 
+ # 2. There is a [key, value] pair where the key and value are both Strings and the value starts with `a`.
+ hash.find { |k, v| 
+ (k.is_a? Integer and v.is_a? Integer and v < 20) or
+ (k.is_a? String and v.is_a? String and v[0] == 'a') }
+end