How to store JavaScript functions in a queue and execute in that order?

Last Updated : 28 Jun, 2023

In this article, the task is to execute the functions in the order defined in the queue with the help of JavaScript. There are two approaches that are discussed below.

Approach 1: Declare the functions and use the array push() method to push the functions in the array. Later traverse the array and execute the functions one by one.

Example: This example implements the above approach.

JavaScript

function myGFG() {

    // First function
    function function1() {
        console.log("First Function");
    }

    // Second function
    function function2() {
        console.log("Second Function");
    }

    let orderQueue = [];

    // Push them in queue
    orderQueue.push(function1);
    orderQueue.push(function2);

    while (orderQueue.length > 0) {
    
        // Execute in order
        orderQueue.shift()();
    }

    console.log("Functions executed in queue order");
}

myGFG();

Output

First Function
Second Function
Functions executed in queue order

Approach 2: Declare the functions and use array indexing to assign the functions to index of the array in the order. Later traverse the array and execute the functions one by one.

Example: This example implements the above approach.

JavaScript

function myGFG() {

    // First function
    function function1() {
        console.log("First Function");
    }

    // Second function
    function function2() {
        console.log("Second Function");
    }

    let functions = new Array();

    // Adding the functions in the order
    // in queue(array)
    functions[0] = function1;
    functions[1] = function2;
    
    for (let i = 0; i < functions.length; i++) {

        // Executing them in order.
        functions[i].call();
    }
    
    console.log("Functions executed in queue order");
}

myGFG();

Output

First Function
Second Function
Functions executed in queue order

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