Add logical both

snippets/both.md

@@ -0,0 +1,20 @@
+---
+title: both
+tags: function,logic,beginner
+---
+
+Returns `true` if both functions return `true` for a given set of arguments, `false` otherwise.
+
+Use the logical and (`&&`) operator on the result of calling the two functions with the supplied `args`.
+
+```js
+const both = (f, g) => (...args) => f(...args) && g(...args);
+```
+
+```js
+const isEven = num => num % 2 === 0;
+const isPositive = num => num > 0;
+const isPositiveEven = both(isEven, isPositive);
+isPositiveEven(4); // true
+isPositiveEven(-2); // false
+```