Add logical either

snippets/either.md

@@ -0,0 +1,20 @@
+---
+title: either
+tags: function,logic,beginner
+---
+
+Returns `true` if at least one function returns `true` for a given set of arguments, `false` otherwise.
+
+Use the logical or (`||`) operator on the result of calling the two functions with the supplied `args`.
+
+```js
+const either = (f, g) => (...args) => f(...args) || g(...args);
+```
+
+```js
+const isEven = num => num % 2 === 0;
+const isPositive = num => num > 0;
+const isPositiveOrEven = either(isPositive, isEven);
+isPositiveOrEven(4); // true
+isPositiveOrEven(3); // true
+```