---
title: "TypeScript: String to Number"
slug: typescript-string-to-number
date_published: "2021-05-16T23:41:38.000Z"
date_updated: "2021-05-16T23:41:38.000Z"
tags: ["software-engineering"]
draft: false
images: ["/content/images/2021/05/number-parsing-comparison.png"]
---

This article is part of my TypeScript series. Please, consider subscribing to my newsletter for tips on programming, entrepreneurship and design.

I have noticed [multiple](https://stackoverflow.com/questions/14667713/how-to-convert-a-string-to-number-in-typescript) [questions](https://stackoverflow.com/questions/23437476/in-typescript-how-to-check-if-a-string-is-numeric) regarding how to convert a String value to a Number using TypeScript.

The answer is that you can convert String to Numbers just the same way than JavaScript, using `parseInt("42")`, `parseFloat("42")`, `+"42"` or `Number("42")`.

```typescript
const numberString: string = "42";

const number: number = parseInt(numberString);
const number: number = parseFloat(numberString);
const number: number = +numberString;
const number: number = Number(numberString);
```

Multiple approaches return the same number type parsing a string number

[This StackOverflow answer](https://stackoverflow.com/questions/17106681/parseint-vs-unary-plus-when-to-use-which/17106702#17106702) compares a multitude of alternative methods:

![](/content/images/2021/05/number-parsing-comparison.png)

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