move error handling to the bottom

conversions/weight_conversions.rb

@@ -3,70 +3,47 @@
 module WeightConversion
   # Kilogram -> Gram = (kilogram_value * 1000) grams
   def self.kilogram_to_gram(kilogram_input)
-    if Integer === kilogram_input
-      gram = kilogram_input * 1000
-      "#{kilogram_input} kg = #{gram} g"
-    else
-      raise
-    end
-    rescue
-      "Error: Please provide number only!"
+    raise StandardError unless Integer === kilogram_input
+
+    gram = kilogram_input * 1000
+    "#{kilogram_input} kg = #{gram} g"
   end
 
   # Gram -> Kilogram = (gram_value / 1000) kilograms
   def self.gram_to_kilogram(gram_input)
     kilogram = gram_input / 1000
+
     "#{gram_input} g = #{kilogram} kg"
-   rescue
-     "Error: Please provide number only!"
   end
 
   # Pound -> Ounce = (pound_value * 16) oz
   def self.pound_to_ounce(pound_input)
-    if Integer === pound_input
-      ounce = pound_input * 16
-      "#{pound_input} lb = #{ounce} oz"
-    else
-      raise
-    end
-    rescue
-      "Error: Please provide number only!"
+    ounce = pound_input * 16
+
+    "#{pound_input} lb = #{ounce} oz"
   end
 
   # Ounce -> Pound = (ounce_value / 16) lb
   def self.ounce_to_pound(ounce_input)
-    if Integer === ounce_input
-      pound = ounce_input / 16
-      "#{ounce_input} oz = #{pound} lb"
-    else
-      raise
-    end
-    rescue
-      "Error: Please provide number only!"
+    pound = ounce_input / 16
+
+    "#{ounce_input} oz = #{pound} lb"
   end
 
   # Kilogram -> Pound = (kilogram_input * 2.205) lb
   def self.kilogram_to_pound(kilogram_input)
-    if Integer === kilogram_input
-      pound = (kilogram_input * 2.205).round(2)
-      "#{kilogram_input} kg = #{pound} lb"
-    else
-      raise
-    end
-    rescue
-      "Error: Please provide number only!"
+    pound = (kilogram_input * 2.205).round(2)
+
+    "#{kilogram_input} kg = #{pound} lb"
   end
 
   # Pound -> Kilogram = (pound_input / 2.205) kg
   def self.pound_to_kilogram(pound_input)
-    if Integer === pound_input
-      kilogram = (pound_input / 2.205).round(2)
-      "#{pound_input} lb = #{kilogram} kg"
-    else
-      raise
-    end
-    rescue
-      "Error: Please provide number only!"
+    raise StandardError unless Integer === pound_input
+
+    kilogram = (pound_input / 2.205).round(2)
+
+    "#{pound_input} lb = #{kilogram} kg"
   end
 end
 
@@ -85,15 +62,38 @@ puts WeightConversion.pound_to_kilogram(100)
 # 100 lb = 45.35 kg
 
 # Invalid inputs
-puts WeightConversion.kilogram_to_gram("a")
-# Error: Please provide number only!
-puts WeightConversion.gram_to_kilogram("3000")
-# Error: Please provide number only!
-puts WeightConversion.pound_to_ounce("16")
-# Error: Please provide number only!
-puts WeightConversion.ounce_to_pound("x ")
-# Error: Please provide number only!
-puts WeightConversion.kilogram_to_pound("weight")
-# Error: Please provide number only!
-puts WeightConversion.pound_to_kilogram("100")
-# Error: Please provide number only!
+begin
+  puts WeightConversion.kilogram_to_gram("a")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end
+
+begin
+  puts WeightConversion.kilogram_to_gram("3000")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end
+
+begin
+  puts WeightConversion.kilogram_to_gram("16")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end
+
+begin
+  puts WeightConversion.kilogram_to_gram("x ")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end
+
+begin
+  puts WeightConversion.kilogram_to_gram("weight")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end
+
+begin
+  puts WeightConversion.kilogram_to_gram("100")
+rescue StandardError
+  puts "Error: Please provide number only!"
+end