Sometimes, you may come across a requirement that once the array is created, its length should not be changed. In this blog post, let us explore how you can achieve that. Let us say you have an array as shown below, let foo = ['1', '11']; console.log(foo.length); // 2 console.log(foo[1]); //11 As you see, the length of the array is 2, and … Continue reading How to make the length of an Array read-only in JavaScript
Change Detection in Angular
Change Detection is the backbone of the Angular framework, and each component has its own change detector. This article explains change detection strategies and optimizations to help you write highly performant Angular applications. Angular can detect when data changes in the component, and can re-render the view to display the updated data. Angular makes sure … Continue reading Change Detection in Angular
Video- Master 3 important concepts of JavaScript
In this webinar learn 3 most important concepts of JavaScript. How to calculate the value of 'this' inside a function All about object literals function constructors and prototypes https://www.youtube.com/watch?v=F2V7MgehDSY
Link Constructors prototypes to create Inheritance in JavaScript
In JavaScript, there are multiple ways to create an object. However, among all the most popular is using a function as a constructor. A function returns a newly created object if it is called using the new, which is also known as Constructor Invocation Pattern. You can create a function constructor like any other … Continue reading Link Constructors prototypes to create Inheritance in JavaScript
How Object.entries work internally in JavaScript
In JavaScript, the Object.entries method returns an array of object’s own enumerable properties. It returns properties as a [key, value] pair, where the key is a string. You can read enumerable properties as an array of key-value pairs using the Object.entries method as shown below, let Product = { Title: 'Book', Price: 120, Author: undefined, inStock: true } console.log(Object.entries(Product)); Since it returns … Continue reading How Object.entries work internally in JavaScript
Video – Master RxJS: Part 1
Working with objects in a JavaScript Arrow Function
The JavaScript Arrow function is a shorter way of writing a function expression. Let us say you have a function expression as below, var add = function (num1, num2) { return num1 + num2; } The above function can refactor for a shorter syntax using the arrow function as below, var add = (num1, num2) => num1 + num2; So, as you see, the arrow function provides a convenient and short syntax … Continue reading Working with objects in a JavaScript Arrow Function
Video- High-level introduction of generator functions in JavaScript
This video gives very high level introduction of generator in JavaScript https://www.youtube.com/watch?v=zY1AaITBAMM
Why use new.target inside a function in JavaScript – Simplified
There are four invocation patterns in JavaScript, which means you can call a function in four possible ways. They are, Function Invocation PatternConstructor Invocation PatternMethod Invocation PatternIndirect Invocation Pattern Essentially, these four-invocation patterns determine the value of ‘this’ object inside a function. Let us consider the function created below, function add(num1, num2) { console.log(this); // global object } let a = add(8, 9); In the … Continue reading Why use new.target inside a function in JavaScript – Simplified
Return JSON from a SQL Query
Do you know, you can return JSON data from a SQL query? It is very useful in writing REST or GraphQL API on the top of a SQL Server Database. Let us say you have two tables as shown below, And an emp table as below, You can query employees with their departments as below, … Continue reading Return JSON from a SQL Query
