Related Articles

JavaScript parseFloat() Function

• Last Updated : 06 Jul, 2020

Below is the example of the parseFloat() function.

• Example:
 ``
• Output:
`Using parseFloat("3.14") = 3.14`

The parseFloat() function is used to accept the string and convert it into a floating-point number. If the string does not contain a numeral value or If the first character of the string is not a Number then it returns NaN i.e, not a number. It actually returns a floating-point number parsed up to that point where it encounters a character that is not a Number.

Syntax:

`parseFloat(Value)`

Parameters: This function accept a single parameter as mentioned above and described below:

• value This parameter ontains a string which is converted to a floating-point number.

Return value: It returns a floating-point Number and if the first character of a string cannot be converted to a number then the function returns NaN i.e, not a number.

Below examples illustrate the parseFloat() function in JavaScript:

• Example 1: The parseFloat() function ignores leading and trailing spaces and returns the floating point Number of the string.
```Input : var n = parseFloat("  2018  ");
Output: n=2018 (floating point Number)```
• Example 2:
```Input: var a = parseFloat("1000.04");
Output:now a = 1000.04(floating point Number)```

More example codes for the above function are as follows:

Program 1:

 ````` ` ````` ` ````

Output:

```parseFloat(" 100 ") = 100
parseFloat("2018@geeksforgeeks") = 2018
parseFloat("geeksforgeeks@2018") = NaN
parseFloat("3.14") = 3.14
parseFloat("22 7 2018") = 22```

Program 2: Using isNaN() function to test that converted values are valid number or not.

 ````` ` ````` ` ```           `

Output:

```x is a number
y is not a number
Using parseInt("3.14") = 3
Using parseFloat("3.14") = 3.14```

Supported Browsers: