lib/zx/result.rb in zx-result-0.0.1 vs lib/zx/result.rb in zx-result-0.0.2

@@ -69,19 +69,29 @@
 
     def then(&block)
       fmap(&block)
     end
 
+    def step(&block)
+      fmap(&block)
+    end
+
     def fmap(&block)
       return self if failure?
 
       new_value = block.call @value
       @value = new_value
 
       self
     end
 
+    def check(&block)
+      return self if !!block.call(@value)
+
+      failure!
+    end
+
     def failure!(value = nil, type: :error)
       @type = type.to_sym
       @success = false
       @value = value
 
@@ -104,18 +114,18 @@
     private :__execute__
 
     def Success(value = nil, options = {})
       success!(value, type: options.fetch(:type, :ok))
     end
-    
+
     def Success!(value = nil, options = {})
       success!(value, type: options.fetch(:type, :ok))
     end
 
     def Failure(value = nil, options = {})
       failure!(value, type: options.fetch(:type, :error))
     end
-    
+
     def Failure!(value = nil, options = {})
       failure!(value, type: options.fetch(:type, :error))
     end
 
     def self.Success(value = nil, options = {})