20 lines
402 B
Markdown
20 lines
402 B
Markdown
---
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title: isPowerOfTwo
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tags: math,beginner
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---
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Returns `true` if the given number is a power of `2`, `false` otherwise.
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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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