Number

`Number.parseFloat`

Parses an argument and returns a floating-point number

Syntax

JavaScript

Number.parseFloat(string)

Parameters

Parameter	Type	Description
string	string	The value to parse

Return Value

A floating-point number, or NaN if parsing fails

Examples

Basic Usage

console.log(Number.parseFloat('3.14')); // 3.14
console.log(Number.parseFloat('314e-2')); // 3.14

Practical Example

console.log(Number.parseFloat('3.14some text')); // 3.14
console.log(Number.parseFloat('text')); // NaN

Advanced Usage

const prices = ['$9.99', '$14.50', '$3.01'];
const nums = prices.map(p => Number.parseFloat(p.slice(1)));
console.log(nums); // [9.99, 14.5, 3.01]

Understanding Number.parseFloat

The Number.parseFloat method in JavaScript parses an argument and returns a floating-point number. It belongs to the Number object and is one of the most widely used methods for working with number values in modern JavaScript and TypeScript applications.

The method signature is Number.parseFloat(string). It accepts 1 parameter: string. When called, it returns a floating-point number, or nan if parsing fails. Understanding when and how to use parseFloat() helps you write more expressive, readable code.

Common use cases for Number.parseFloat include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like number-parseint, number-isnan, number-isfinite, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Number.parseFloat is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.