Added linting, processed current snippets

snippets/measure-time-taken-by-function.md

@@ -8,6 +8,6 @@ const timeTaken = callback => {
   const t0 = performance.now(), r = callback();
   console.log(performance.now() - t0);
   return r;
-}
+};
 // timeTaken(() => Math.pow(2, 10)) -> 1024 (0.010000000009313226 logged in console)
 ```