lib/execjs/external_runtime.rb in execjs-0.2.0 vs lib/execjs/external_runtime.rb in execjs-0.2.1

@@ -110,18 +110,22 @@
           end
         end
       end
 
       def which(command)
-        Array(command).find do |name|
+        Array(command).each do |name|
           name = name.split(/\s+/).first
           result = if ExecJS.windows?
             `#{ExecJS.root}/support/which.bat #{name}`
           else
-            `which #{name} 2>&1`
+            `which #{name} 2>/dev/null`
           end
-          result.strip.split("\n").first
+
+          if path = result.strip.split("\n").first
+            return path
+          end
         end
+        nil
       end
 
       if "".respond_to?(:force_encoding)
         def sh(command)
           output, options = nil, {}