freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix/index.md

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title: Use the parseInt Function with a Radix
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# Use the parseInt Function with a Radix


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## Hints

### Hint 1
If you use a variable to assign the result of `parseInt(str)` to it, remember to return that variable. 
Otherwise you can just use a `return` statement for your function.

### Hint 2
In this exercise you need to "convert" a binary number into a decimal number using the `radix` parameter in order to specify the base on which the input number is represented on.


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
function convertToInteger(str) {
  return parseInt(str, 2);
}
convertToInteger("10011");
```

#### Code Explanation
- The function takes `str` and returns an integer instead of a string but "understanding" its a binary number instead of a decimal one thanks to the `radix` parameter (2).


#### Relevant Links

- ["parseInt()" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt)
- ["Radix" - *Wikipedia*](https://en.wikipedia.org/wiki/Radix)

</details>