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The Publisher–Subscriber (Pub-Sub) pattern is a messaging pattern where senders (publishers) do not directly communicate with receivers (subscribers). Instead, subscribers register their interest, and the publisher notifies them when something happen...
What is Stack? A stack is an ordered collection of items that follow the (LIFO) Last In First Out principle. The addition and removal of items take place at the same end i.e. at the top. The newest elements are at the top and the oldest elements are ...
Arrow functions were introduced in ES6. It behaves differently from the traditional functions of Javascript. Syntax const functionName = (parameters) => { //function body } const getName = (age) => { let name = 'Bobby'; return `${name} is...
What is a function? A function is a reusable piece of code that takes some input, performs some task and returns a value. A function stores a piece of code that we want to use repeatedly. To use a function, we call that function by its name. // Defin...
Javascript is a synchronous single-threaded language. JS executes all operations on a single thread. It executes one thing at a time. The Event loop gives us the illusion of asynchronous programming in JavaScript. Before understanding the event loop,...
We use the then() and catch() method to handle promises. But we have another way of handling promises and that is async/await. Sometimes, using too many then() and catch() creates messy and unreadable code. async/await is just a more elegant way of h...
A Promise is an object which is used to find out if the asynchronous operation is completed or not. The Promise object has two properties: state and result. State: pending: initial state, neither fulfilled nor rejected. fulfilled: meaning that the ...
What is a callback? A callback function is a function that is passed into another function as an argument, which is then invoked inside that outer function after when a specific task is completed. // add function function add(x,y){ return x+y } ...
What is Synchronous in JavaScript? JavaScript is a synchronous single-threaded language. Synchronous means the execution of the code happens sequentially means only one statement can be executed at a time. Each statement executes after the execution ...
