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snippets/js/s/both.md

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+---
+title: Logical and for functions
+type: snippet
+language: javascript
+tags: [function,logic]
+unlisted: true
+cover: succulent-2
+dateModified: 2021-01-04T13:04:15+02:00
+---
+
+Checks if both of the given functions return `true` for a given set of arguments.
+
+- 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
+```