Linted everything, removed semistandard

snippets/factorial.md

@@ -11,8 +11,8 @@ Throws an exception if `n` is a negative number.
 const factorial = n =>
   n < 0
     ? (() => {
-        throw new TypeError('Negative numbers are not allowed!');
-      })()
+      throw new TypeError('Negative numbers are not allowed!');
+    })()
     : n <= 1
       ? 1
       : n * factorial(n - 1);