Add 6 new snippets

snippets/callOrReturn.md

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+---
+title: Call or return
+tags: function
+expertise: beginner
+firstSeen: 2022-04-04T05:00:00-04:00
+---
+
+Calls the argument if it's a function, otherwise returns it.
+
+- Use the `typeof` operator to check if the given argument is a function.
+- If it is, use the spread operator (`...`) to call it with the rest of the given arguments. Otherwise, return it.
+
+```js
+const callOrReturn = (fn, ...args) =>
+  typeof fn === 'function' ? fn(...args) : fn;
+```
+
+```js
+callOrReturn(x => x + 1, 1); // 2
+callOrReturn(1, 1); // 1
+```