Change literal for a constant

Author: MarcAragones

README.md

@@ -628,9 +628,11 @@ const programmerOutput = [
   }
 ];
 
+const INITIAL_VALUE = 0;
+
 const totalOutput = programmerOutput
   .map((programmer) => programmer.linesOfCode)
-  .reduce((acc, linesOfCode) => acc + linesOfCode, 0);
+  .reduce((acc, linesOfCode) => acc + linesOfCode, INITIAL_VALUE);
 ```
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