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javascript/snippets/is-power-of-two.md

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+---
+title: Number is power of two
+type: snippet
+tags: [math]
+author: chalarangelo
+cover: flower-portrait-10
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+Checks if the given number is a power of `2`.
+
+- Use the bitwise binary AND operator (`&`) to determine if `n` is a power of `2`.
+- Additionally, check that `n` is not falsy.
+
+```js
+const isPowerOfTwo = n => !!n && (n & (n - 1)) == 0;
+```
+
+```js
+isPowerOfTwo(0); // false
+isPowerOfTwo(1); // true
+isPowerOfTwo(8); // true
+```