# A Mistery of parseInt() in JavaScript

Solving a mistery of how parseInt() parses small float numbers in JavaScript. parseInt() is a built-in JavaScript function that parses integers from numerical strings.

Solving a mistery of how parseInt() parses small float numbers in JavaScript.

`parseInt()` is a built-in JavaScript function that parses integers from numerical strings. For example, let’s parse the integer from the numeric string `'100'`:

``````const number = parseInt('100');
number; // 100``````

As expected, `'100'` is parsed to integer `100`.

`parseInt(numericalString, radix)` also accepts a second argument: the radix at which the numerical string argument is. The radix argument allows you to parse integers from different numerical bases, the most common being 2, 8, 10, and 16.

Let’s use `parseInt()` to parse a numerical string in base 2:

``````const number = parseInt('100', 2);
number; // 4``````

`parseInt('100', 2)` parses `'100'` as an integer in numerical base 2: thus it returns the value `4` (in decimal).

That’s pretty much a short introduction to `parseInt()`.

• A mystery behavior of parseInt()
• Discovering the mystery of parseInt()

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