JavaScript parseFloat() function

Definition and usage

parseFloat() The function parses the string and returns a floating-point number.

This function determines whether the first character of the specified string is a digit. If it is, it parses the string until it reaches the end of the number, and returns the number as a number rather than a string.

Note:Only returns the first number in the string!

Note:Leading and trailing spaces are allowed.

Note:If the first character cannot be converted to a number,parseFloat() Returns NaN.

Example

Parsing different strings:

var a = parseFloat("10")
var b = parseFloat("10.00")
var c = parseFloat("10.33")
var d = parseFloat("34 45 66")
var e = parseFloat(" 60 ")
var f = parseFloat("40 years")
var g = parseFloat("He was 40")

try it yourself

syntax

parseFloat(string)

Parameter Value

Parameter Description
string Required. The string to be parsed.

Technical Details

Return Value: Numbers. If the first character cannot be converted to a number, then returns NaN.
JavaScript Version: ECMAScript 1

Browser Support

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