# What is the use of ()(parenthesis) brackets in accessing a function in JavaScript?

JavascriptObject Oriented ProgrammingFront End Technology

The ()(parenthesis) brackets play an important role in accessing a function. Accessing a function without () will return the function definition instead of the function result. If the function is accessed with () then the result can be obtained.

## Without ()

### Example

In the following example, the function is accessed without () so the function definition is returned instead of the result as shown in the output.

Live Demo

<html>
<body>
<script>
function toCelsius(f) {
return (5/9) * (f-32);
}
document.write(toCelsius);
</script>
</body>
</html>

### Output

function toCelsius(f) { return (5/9) * (f-32); }

## With ()

### Example

In the following example, the function is accessed with () so instead of the function definition, the result is displayed as shown in the output.

Live Demo

<html>
<body>
<script>
function toCelsius(f) {
return (5/9) * (f-32);
}
document.write(toCelsius(208));
</script>
</body>
</html>

### Output

97.77777777777779
Published on 29-Jul-2019 18:10:53