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JavaScript Number parseFloat() Method

JavaScript Number parseFloat() Method with example, javascript math methods, abs() method, round() method, ceil() method, floor() method, pow() method, random() method, sqrt() method, max() method, min() method, log() method, sin() method, cos() method, tan() method etc.

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JavaScript Number parseFloat() method

The JavaScript number parseFloat() method parses a string argument and converts it into a floating point number. It returns NaN, if the first character of given value cannot be converted to a number.

Syntax

The parseFloat() method is represented by the following syntax:

Number.parseInt(string)

Parameter

string - It represents the string to be parsed.

Return

A floating point number parsed from the given value.

JavaScript Number parseFloat() method example

Here, we will understand parseFloat() method through various examples.

Example 1

Let's see a simple example of parseFloat() method.

<script>
var a="50";
var b="50.25"
var c="String";
var d="50String";
var e="50.25String"
document.writeln(Number.parseFloat(a)+"<br>");
document.writeln(Number.parseFloat(b)+"<br>");
document.writeln(Number.parseFloat(c)+"<br>");
document.writeln(Number.parseFloat(d)+"<br>");
document.writeln(Number.parseFloat(e)); 
</script>
Test it Now

Output:

50
50.25
NaN
50
50.25

Example 2

Let's see an example to add two strings with and without using parseFloat() method.

<script>
var a="10.45";
var b="20.55";
var c=a+b;
document.writeln("Before invoking parseFloat(): "+c+"<br>");
var c=Number.parseFloat(a)+Number.parseFloat(b);
document.writeln("After invoking parseFloat(): "+c);
</script>
Test it Now

Output:

Before invoking parseFloat(): 10.4520.55
After invoking parseFloat(): 31

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