JavaScript Function toString() method

The JavaScript Function toString() method returns a string. Here, string represents the source code of the function.

Syntax

Return Value

It returns a string.

JavaScript Function toString() method Example

Example 1

Let's see an example to display a function in the form of string.

<script>
function add(a,b) {
  return a + b;
}
document.writeln(add.toString());
document.writeln(typeof add.toString());
</script>

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Output:

"function add(a,b) { return a + b; }" "string"

Example 2

Let's see an example to display the addition of numbers in the form of string.

<script>
function add(a,b) {
  return a + b;
}	
document.writeln(add(10,20).toString());//30
document.writeln(typeof add(10,20).toString());//string
</script>

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Output:

30 string

Example 3

Let's see an example to display the ceil value of the given numbers in the form of string.

<script>
function absolute(num) {
  return Math.ceil(num);
}
document.writeln(absolute(15.4).toString());
document.writeln(typeof absolute(15.4).toString());</script>

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Output: