24 lines
499 B
Markdown
24 lines
499 B
Markdown
---
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title: Number is power of two
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tags: math
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author: chalarangelo
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cover: flower-portrait-10
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firstSeen: 2019-12-31T13:17:12+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Checks if the given number is a power of `2`.
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- Use the bitwise binary AND operator (`&`) to determine if `n` is a power of `2`.
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- Additionally, check that `n` is not falsy.
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```js
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const isPowerOfTwo = n => !!n && (n & (n - 1)) == 0;
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```
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```js
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isPowerOfTwo(0); // false
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isPowerOfTwo(1); // true
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isPowerOfTwo(8); // true
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```
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