How to Pass Function as Parameter in JavaScript
Hi devs, in this article, I’m going to show how to pass function as parameter in JavaScript. Let’s have a look at some examples:
Table of Contents
Example 1
Have a look at an example:
function add(a, b) {
return a+b;
}
function subtract(a, b) {
return a-b;
}
function calculation(pass_function) {
var x = 10;
var y = 5;
return pass_function(x, y);
}
console.log(calculation(add)); // 15
console.log(calculation(subtract)); // 10Example 2
Take a look at another example:
function addBook(id, refreshCallback) {
refreshCallback();
}
function refreshBookList() {
console.log('Load all books');
}
addBook(1, refreshBookList); // Load all booksWe can also pass argumets if we needed:
function addBook(id, refreshCallback) {
refreshCallback(id);
}
function refreshBookList(id) {
console.log('New book id: ' + id);
}
addBook(1, refreshBookList); // New book id: 1Share on Social Media
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