Add isPowerOfTen

snippets/isPowerOfTen.md

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+---
+title: isPowerOfTen
+tags: math,beginner
+---
+
+Checks if the given number is a power of `10`.
+
+- Use `Math.log10()` and the modulo operator (`%`) to determine if `n` is a power of `10`.
+
+```js
+const isPowerOfTen = n => Math.log10(n) % 1 === 0;
+```
+
+```js
+isPowerOfTen(1); // true
+isPowerOfTen(10); // true
+isPowerOfTen(20); // false
+```