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What are promises in JavaScript Before understanding what are promises in JavaScript, Let's understand the execution flow in the JavaScript. In general, the JavaScript execution model is synchronous as it is a single-threaded. Javascript can execute one task at a time, apart from that it provides some methods like promises…
Javascript what are closures used for Closure in JavaScript holds the combination of function and the lexical environment within the same function that the lexical environment has been declared. Consider a below example function Person() { var name = 'Rajani'; function displayName() { console.log(name); } displayName(); } Person(); // output…
For better understanding what is the difference between var and let in javascript, let us understand the scope concept in JavaScript. Basically JavaScript has a different scope like Global Scope: The variable declared globally and the same variable is available for access throughout your code. Function Scope: The variable…
What is javascript Javascript is a lightweight, cross-platform and object-oriented computer programming language. Lightweight: The Javascript uses very little memory of the computer. And Javascript has a very simple syntax. Cross-platform: Javascript can be used on multiple platforms and systems. Object-oriented: Javascript is a language that's based on objects. Everything…
Difference between undefined and null in javascript In this article, we will study what is the difference between undefined and null in javascript with examples, let's look at the definition of What is undefined in Javascript? In javascript undefined is also treated as a primitive value. That means it is…