Example
Parse different strings:
var a = parseFloat("10") + "<br>";
var b = parseFloat("10.00") + "<br>";
var c = parseFloat("10.33") + "<br>";
var d = parseFloat("34 45 66") + "<br>";
var e = parseFloat(" 60 ") + "<br>";
var f = parseFloat("40 years") + "<br>";
var g = parseFloat("He was 40") + "<br>";
var n = a + b + c + d + e +
f + g;
The result of n will be:
10
10
10.33
34
60
40
NaN
Try it Yourself »
Definition and Usage
The parseFloat() function parses a string and returns a floating point number.
This function determines if the first character in the specified string is a number. If it is, it parses the string until it reaches the end of the number, and returns the number as a number, not as a string.
Note: Only the first number in the string is returned!
Note: Leading and trailing spaces are allowed.
Note: If the first character cannot be converted to a number, parseFloat() returns NaN.
Browser Support
| Function | |||||
|---|---|---|---|---|---|
| parseFloat() | Yes | Yes | Yes | Yes | Yes |
Syntax
parseFloat(string)
Parameter Values
| Parameter | Description |
|---|---|
| string | Required. The string to be parsed |
Technical Details
| Return Value: | A Number. If the first character cannot be converted to a number, NaN is returned |
|---|---|
| JavaScript Version: | 1.0 |
< JavaScript Global Functions