Javascript | Number() Function

Number() is an in built javascript function which is used to convert data type to number.

Syntax:

Number(query javascript variable)

Parameters: The parameter of the number function is the javascript variable which is user input to be converted.The number function converts any type of javascript variable to number type.

Return Values:
Number() function returns the number format for any type of javascript variable.

Examples:

Input : Number(true);
Number(false);
Output : 1
0

Input : Number("10 20");
Output : NaN
Not a number is returned by the compiler.

Input : Number(new Date("2017-09-30"));
Output : 1506729600000
The Number() method above returns the number of milliseconds since 1.1.1970.

Input : Number("John");
Output : NaN

Below Programs illustrate the given examples more clearly.

<script> 
    // JavaScript to illustrate Number() function 
    function func() { 
  
        // Original string 
        var a = "True"; 
  
        var value = Number(a); 
        document.write(value); 
    } 
// Driver code 
func(); 
< /script>  

Output:

Program 2:

<script> 
    // JavaScript to illustrate Number() function 
    function func() { 
  
        // Original string 
        var a = "10 20"; 
  
        var value = Number(a); 
        document.write(value); 
    } 
// Driver code 
func(); 

Output:

NaN

Program 3:

<script> 
    // JavaScript to illustrate Number() function 
    function func() { 
        var value = Number(new Date("2017-09-30")); 
        document.write(value); 
    } 
// Driver code 
func(); 
< /script>  

Output:

1506729600000

Program 4:

<script> 
    // JavaScript to illustrate Number() function 
    function func() { 
        var value = Number("John"); 
        document.write(value); 
    } 
// Driver code 
func(); 
< /script>  

Output:

NaN

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