Year: 2017
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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…
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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…
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Simplifying Content Projection in Angular
In Angular, content projection is used to project content in a component. Let’s take a closer look at how it works: Content projection allows you to insert a shadow DOM in your component. To put it simply, if you want to insert HTML elements or other components in a component, then you do that using…
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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…
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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…
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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…
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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…
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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…
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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…
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Video- what is let statement in JavaScript
In this video , learn “what is let statement in JavaScript “ Since, I have recorded this video in Starbucks, there is some noise. I am sorry for that. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that…
Dhananjay Kumar 