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javascript/snippets/either.md

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+---
+title: Logical or for functions
+type: snippet
+tags: [function,logic]
+cover: man-red-sunset
+dateModified: 2020-10-19T18:51:03+03:00
+---
+
+Checks if at least one function returns `true` for a given set of arguments.
+
+- 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
+```