JavaScript Number Methods
JavaScript Number Methods
- These number methods can be used on all JavaScript numbers.
| Method | Description |
|---|---|
| toString() | Returns a number as a string |
| toExponential() | Returns a number written in exponential notation |
| toFixed() | Returns a number written with a number of decimals |
| toPrecision() | Returns a number written with a specified length |
| ValueOf() | Returns a number as a number |
The toString() Method
- The toString() method returns a number as a string.
- All number methods can be used on any type of numbers (literals, variables, or expressions)
Sample Code
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Number Methods</h2>
<p>The toString() method converts a number to a string.</p>
<p id="demo"></p>
<script>
let x = 54321;
document.getElementById("demo").innerHTML =
x.toString() + "<br>" +
(54321).toString() + "<br>" +
(54300 + 21).toString();
</script>
</body>
</html>
Output
JavaScript Number Methods
The toString() method converts a number to a string.
54321
54321
54321
The toExponential() Method
- toExponential() returns a string, with a number rounded and written using exponential notation.
- A parameter defines the number of characters behind the decimal point.
Sample Code
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Number Methods</h2>
<p>The toPrecision() method returns a string, with a number written with a specified length:</p>
<p id="demo"></p>
<script>
let x = 9.656;
document.getElementById("demo").innerHTML =
x.toPrecision() + "<br>" +
x.toPrecision(2) + "<br>" +
x.toPrecision(4) + "<br>" +
x.toPrecision(6);
</script>
</body>
</html>
Output
JavaScript Number Methods
The toPrecision() method returns a string, with a number written with a specified length:
9.656
9.7
9.656
9.65600