JavaScript parseFloat() Method

Javascript parseFloat() Method | You’ll need to know how to convert string to float if you need to perform a mathematical operation on a string value. The user submits temperatures as a string type, for example, and the monthly climate report must be prepared using that string. To do so, you’ll need to convert the provided string to a float number first, which you can do with JavaScript’s built-in functions.

Knowing what to do with integers and decimal places in JavaScript is essential, but knowing how to do it is even more important.

This JavaScript tutorial demonstrates how to convert a string to a float using the parseFloat () method in JavaScript. You’ll find out what parseFloat is and what it can do. You’ll find out what parseFloat is and what can be done with it.  You’ll learn the JavaScript Parsing () syntax and when it should be used after reading this article.

Syntax:- parseFloat(string)

The “string” parameter is supplied to JavaScript’s “parseFloat()” method, which returns a floating-point value.

Difference Between parseInt() and parseFloat()

The parseInt() converts a non-integer value to an int, while parseFloat() converts a non-float (with no decimal) to a float (with a decimal).

If a user provides information in the form of a string, you may use the parse method to turn it into a number on which you can do computations.

Let’s have a look at some examples to help you understand the notion a little better. The “typeof” function can be used to determine the type of a string argument.

JavaScript parseFloat Method Example

Example 1: 

In this example, you’ll see how to use JavaScript parseFloat to turn the string “67.34” into a floating-point value.

var num = parseFloat("67.34");
console.log(num)

Output:-

67.34

Example 2:
The parseFloat() method ignores leading and trailing whitespace and returns the string’s floating-point value.

The string ” 987 ” will be converted to the float “987” using the following program:

var num = parseFloat("   987   ");
console.log(num)

Output:-

987

Example 3:
If the string contains a variety of values, the JavaScript parseFloat() method will return a floating-point number until a non-numeric element is encountered. In this scenario, the “parseFloat()” method will convert the string “2029#Knowprogram” to a floating-point number of “2029.”

var str = parseFloat("2029Knowprogram@");
console.log(str)

Output:-

2029

Example 4:
Because the given text “Knowprogram@2029” begins with a non-numeric letter, the JavaScript parseFloat() method will return “NaN” for non-numeric components. For example, 

var str = parseFloat("Knowprogram@2029");
console.log(str)

Output:-

NaN

Example 5:
The JavaScript parseFloat() function will only report the first number identified if the “string” input has spaces between numbers.

For example, in the following example, we’ll pass the string “843 439 49” to the “parseFloat()” method as a parameter which will return the initial number “843”.

var str = parseFloat("843 439 49");
console.log(str)

Output:-

843

Other conditions include:–

1. When parseFloat encounters a character that isn’t a plus (+), minus (-), numerals (0–9), decimal (.), or exponent (e or E), the value up to that letter is returned, with the ineligible letters and characters after it ignored.
2. The insertion of a second decimal point also stops parsing.
3. The parseFloat() may also parse and produce Infinity.
4. The parseFloat() function converts BigInt syntax to Numbers, although precision is lost. This happens because the trailing n character is discarded.

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