Javascript Number() Function

Last Updated : 06 Jul, 2020

Below is the example of the Number() function.

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Example:

<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:
```
1
```

The Number() function is used to convert data type to number.

Syntax:

Number(object)

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

object: This parameter holds the objects that will be converted any type of javascript variable to number type.

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

Below examples illustrate the Number() function in JavaScript:

Example 1:

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

Example 2: Not a number is returned by the compiler.
```
Input : Number("10 20");
Output: NaN
```
Example 3: The Number() method above returns the number of milliseconds since 1.1.1970.
```
Input : Number(new Date("2017-09-30"));
Output : 1506729600000
```
Example 4:
```
Input : Number("John");
Output : NaN
```

More example codes for the above function are as follows:

Program 1:

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

Output:

NaN

Program 2:

<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

Supported Browsers:

Google Chrome
Firefox
Internet Explorer
Safari
Opera

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Javascript Number() Function