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JavaScript: Pass a JavaScript function as parameter

JavaScript Function: Exercise-28 with Solution

Write a JavaScript program to pass a 'JavaScript function' as parameter.

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program to pass a JavaScript function as parameter</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function addStudent(id, refreshCallback)
{
    refreshCallback();  
}

function refreshStudentList() {
    console.log('Hello');
}

addStudent(1, refreshStudentList);

Output:

Hello

Flowchart:

Flowchart: JavaScript function: Pass a 'JavaScript function' as parameter

Live Demo:

See the Pen JavaScript - Pass a JavaScript function as parameter-function-ex- 28 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv