Category: JavaScript
-
What are Template Literals in JavaScript
Read full article on the Infragistics blog In ES6, two types of literals were introduced: Template Literals for string concatenation and expression embedding in a string Tagged Template Literals to tag the Template Literal in a function so the literal can be evaluated in the function Let’s assume that you need to do the string…
-
Simplifying function expressions and the function statement
Read full article on the Infragistics blog In JavaScript, a function can be created in three possible ways: Function as an expression Function as a statement Arrow functions In this post, we will learn about function expressions and the function statement. Consider the following code: This file contains bidirectional Unicode text that may be interpreted…
-
What are getters and setters in JavaScript
In JavaScript, you may have heard of getters and setters. Let’s take a look at what these things are. First, a setter is used to set the value of a property. A setter gets called each time the value of the property is changed. In other words, it executes a function for each time a…
-
JavaScript Object Property Descriptors
In JavaScript, you can create an object literal as shown in the listing below: At first sight, it looks like the object cat has two properties with a string and number value. However, it’s much more than that to a JavaScript interpreter. In ES5, the concept of a Property Descriptor was introduced. Before we go…
-
Arrow functions in JavaScript
The JavaScript arrow function is a shorter way of writing a function expression that was introduced in ECMAScript 6. Usually in JavaScript, you can create a function in two ways: Function as statement Function as expression A function statement can be created as shown below: The same function can be created as a function expression…
-
Simplifying function hoisting in JavaScript
To understand function hoisting, let us start by considering the code listed below: In any other programming language, the output here would be a reference error. However, in JavaScript you will get undefined as the output. Why? Because JavaScript hoists variables at the top of the execution context. An execution context could be the function…
-
What is the arguments object in a JavaScript function?
A JavaScript function has array-like objects called arguments which correspond to the arguments passed to the function. All arguments passed to a JavaScript function can be referred using the arguments object. Now as we get started, let’s consider the code listed here: In the above function, num1 and num2 are two arguments. You can refer…
-
What is a Default Parameter in a JavaScript function?
A JavaScript function can have default parameters values. Using default function parameters, you can initialize formal parameters with default values. If you do not initialize a parameter with some value, then the default value of the parameter is undefined. While calling function foo, you are not passing any parameter, so the default value of variable…
-
What is the Rest Parameter in a Function?
Learn full article on Infragistics blog A JavaScript function can take any number of parameters. Unlike other languages like C# and Java, you can pass any number of parameters while calling a JavaScript function. JavaScript functions allows unknown number of function parameters. Before ECMAScript 6, JavaScript had arguments variable to access these unknown or variable…
-
What is “let” statement in JavaScript?
Using the let statement, you can create Block scoped local variables in JavaScript. The let statement was introduced in the ECMAScript 6 standard of JavaScript. Before ECMAScript 6, JavaScript had three types of scoping: Global scoping Functional scoping Lexical scoping To explore let statement in detail, consider the code snippet given below: This file contains…
Dhananjay Kumar 