TheNumber.parseFloat() static method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returnsNaN.

Try it

function circumference(r) {  if (Number.isNaN(Number.parseFloat(r))) {    return 0;  }  return parseFloat(r) * 2.0 * Math.PI;}console.log(circumference("4.567abcdefgh"));// Expected output: 28.695307297889173console.log(circumference("abcdefgh"));// Expected output: 0

Syntax

Number.parseFloat(string)

Parameters

string

The value to parse,coerced to a string. Leadingwhitespace in this argument is ignored.

Return value

A floating point number parsed from the givenstring.

OrNaN when the first non-whitespace character cannot be converted to a number.

Examples

Number.parseFloat vs. parseFloat

This method has the same functionality as the globalparseFloat() function:

Number.parseFloat === parseFloat; // true

Its purpose is modularization of globals.

SeeparseFloat() for more detail and examples.

Specifications

Browser compatibility

See also

• Polyfill ofNumber.parseFloat incore-js
• es-shims polyfill ofNumber.parseFloat
• Number
• parseFloat()