21 lines
415 B
Markdown
21 lines
415 B
Markdown
---
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title: isPowerOfTen
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tags: math,beginner
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firstSeen: 2021-01-06T22:53:58+02:00
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lastUpdated: 2021-01-06T22:53:58+02:00
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---
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Checks if the given number is a power of `10`.
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- Use `Math.log10()` and the modulo operator (`%`) to determine if `n` is a power of `10`.
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```js
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const isPowerOfTen = n => Math.log10(n) % 1 === 0;
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```
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```js
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isPowerOfTen(1); // true
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isPowerOfTen(10); // true
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isPowerOfTen(20); // false
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```
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