1623741323
In TypeScript, enums, or enumerated types, are data structures of constant length that hold a set of constant values. Each of these constant values is known as a member of the enum. Enums are useful when setting properties or values that can only be a certain number of possible values. One common example is the suit value of a single card in a deck of playing cards. Every card that is drawn will either be a club, a diamond, a heart, or a spade; there are no possible suit values beyond these four, and these possible values are not likely to change. Because of this, an enum would be an efficient and clear way to describe the possible suits of a card.
Whereas most features of TypeScript are useful for throwing errors during compilation, enums are also useful as data structures that can hold constants for your code. TypeScript translates enums into JavaScript objects in the final code emitted by the compiler. Because of this, you can use enums to make a codebase more readable, as you can have multiple constant values grouped in the same data structure, while also making the code more type-safe than just having different const
variables laying around.
This tutorial will explain the syntax used to create enum types, the JavaScript code that the TypeScript compiler creates under the hood, how to extract the enum object type, and a use case for enums that involves bit flags in game development.
#typescript #javascript
1654588030
TypeScript Deep Dive
I've been looking at the issues that turn up commonly when people start using TypeScript. This is based on the lessons from Stack Overflow / DefinitelyTyped and general engagement with the TypeScript community. You can follow for updates and don't forget to ★ on GitHub 🌹
If you are here to read the book online get started.
Book is completely free so you can copy paste whatever you want without requiring permission. If you have a translation you want me to link here. Send a PR.
You can also download one of the Epub, Mobi, or PDF formats from the actions tab by clicking on the latest build run. You will find the files in the artifacts section.
All the amazing contributors 🌹
Share URL: https://basarat.gitbook.io/typescript/
Author: Basarat
Source Code: https://github.com/basarat/typescript-book/
License: View license
1620729846
Can you use WordPress for anything other than blogging? To your surprise, yes. WordPress is more than just a blogging tool, and it has helped thousands of websites and web applications to thrive. The use of WordPress powers around 40% of online projects, and today in our blog, we would visit some amazing uses of WordPress other than blogging.
What Is The Use Of WordPress?
WordPress is the most popular website platform in the world. It is the first choice of businesses that want to set a feature-rich and dynamic Content Management System. So, if you ask what WordPress is used for, the answer is – everything. It is a super-flexible, feature-rich and secure platform that offers everything to build unique websites and applications. Let’s start knowing them:
1. Multiple Websites Under A Single Installation
WordPress Multisite allows you to develop multiple sites from a single WordPress installation. You can download WordPress and start building websites you want to launch under a single server. Literally speaking, you can handle hundreds of sites from one single dashboard, which now needs applause.
It is a highly efficient platform that allows you to easily run several websites under the same login credentials. One of the best things about WordPress is the themes it has to offer. You can simply download them and plugin for various sites and save space on sites without losing their speed.
2. WordPress Social Network
WordPress can be used for high-end projects such as Social Media Network. If you don’t have the money and patience to hire a coder and invest months in building a feature-rich social media site, go for WordPress. It is one of the most amazing uses of WordPress. Its stunning CMS is unbeatable. And you can build sites as good as Facebook or Reddit etc. It can just make the process a lot easier.
To set up a social media network, you would have to download a WordPress Plugin called BuddyPress. It would allow you to connect a community page with ease and would provide all the necessary features of a community or social media. It has direct messaging, activity stream, user groups, extended profiles, and so much more. You just have to download and configure it.
If BuddyPress doesn’t meet all your needs, don’t give up on your dreams. You can try out WP Symposium or PeepSo. There are also several themes you can use to build a social network.
3. Create A Forum For Your Brand’s Community
Communities are very important for your business. They help you stay in constant connection with your users and consumers. And allow you to turn them into a loyal customer base. Meanwhile, there are many good technologies that can be used for building a community page – the good old WordPress is still the best.
It is the best community development technology. If you want to build your online community, you need to consider all the amazing features you get with WordPress. Plugins such as BB Press is an open-source, template-driven PHP/ MySQL forum software. It is very simple and doesn’t hamper the experience of the website.
Other tools such as wpFoRo and Asgaros Forum are equally good for creating a community blog. They are lightweight tools that are easy to manage and integrate with your WordPress site easily. However, there is only one tiny problem; you need to have some technical knowledge to build a WordPress Community blog page.
4. Shortcodes
Since we gave you a problem in the previous section, we would also give you a perfect solution for it. You might not know to code, but you have shortcodes. Shortcodes help you execute functions without having to code. It is an easy way to build an amazing website, add new features, customize plugins easily. They are short lines of code, and rather than memorizing multiple lines; you can have zero technical knowledge and start building a feature-rich website or application.
There are also plugins like Shortcoder, Shortcodes Ultimate, and the Basics available on WordPress that can be used, and you would not even have to remember the shortcodes.
5. Build Online Stores
If you still think about why to use WordPress, use it to build an online store. You can start selling your goods online and start selling. It is an affordable technology that helps you build a feature-rich eCommerce store with WordPress.
WooCommerce is an extension of WordPress and is one of the most used eCommerce solutions. WooCommerce holds a 28% share of the global market and is one of the best ways to set up an online store. It allows you to build user-friendly and professional online stores and has thousands of free and paid extensions. Moreover as an open-source platform, and you don’t have to pay for the license.
Apart from WooCommerce, there are Easy Digital Downloads, iThemes Exchange, Shopify eCommerce plugin, and so much more available.
6. Security Features
WordPress takes security very seriously. It offers tons of external solutions that help you in safeguarding your WordPress site. While there is no way to ensure 100% security, it provides regular updates with security patches and provides several plugins to help with backups, two-factor authorization, and more.
By choosing hosting providers like WP Engine, you can improve the security of the website. It helps in threat detection, manage patching and updates, and internal security audits for the customers, and so much more.
#use of wordpress #use wordpress for business website #use wordpress for website #what is use of wordpress #why use wordpress #why use wordpress to build a website
1597206616
How to create enums in TypeScript with their benefits and drawbacks.
In this post, we will cover what TypeScript enums are and how to create them. We’ll also discover the drawbacks of enums and use cases where they work well.
An enum is short for enumeration and is a type that represents named constants. If the meaning of the constant’s value is not apparent, it can make code easier to understand.
Consider the examples below:
if (status === 5) {
// do something
}
if (status === JobStatus.Completed) {
// do something
}
The second if
statement uses an enum. It is arguably easier to understand than the first if
statement.
#typescript #enums #developer
1640898060
In this tutorial, we will Learn how to use Enums with TypeScript.
#Enums #typescript
1582263000
In this article you will learn about Enum in Typescript in detail. This article will help beginners to understand the concept.
Syntax
enum enumName{
constant1, constant2, constant3...
}
Example
Consider traffic signal lights as an example.
We can access the elements using index or by constant name:
enum signalLights{
red, yellow, green
}
let result: string = signalLights[signalLights.red];
console.log(result);
console.log(signalLights[1]);
let output: signalLights = (<any>signalLights)["yellow"];
console.log(output);
Output
red
yellow
1
Consider that in the below rainbowColors is enum & we have not initialized any constants, so it will starts with 0 value and the rest of the constants have auto increamemtal values.
**Example **
enum rainbowColors {
Red,
Orange,
Yellow,
Green,
Blue,
Indigo,
Violet,
}
console.log("color & index value is as follows");
for (let item in rainbowColors) {
if (isNaN(Number(item))) {
console.log(item + " : " + < rainbowColors > rainbowColors[item]);
}
}
Output
color & index value is as follows:
Red : 0
Orange : 1
Yellow : 2
Green : 3
Blue : 4
Indigo : 5
Violet : 6
Consider the below example, rainbowColors is enum & the second element is initialized with value 1000. So it will be auto incremental to the remaining constants. It will print on the console.
**Example **
enum rainbowColors {
Red,
Orange = 1000,
Yellow,
Green,
Blue,
Indigo,
Violet,
}
console.log("color & index value is as follows");
for (let item in rainbowColors) {
if (isNaN(Number(item))) {
console.log(item + " : " + < rainbowColors > rainbowColors[item]);
}
}
Output
color & index value is as follows,
Red : 0
Orange : 1000
Yellow : 1001
Green : 1002
Blue : 1003
Indigo : 1004
Violet : 1005
Consider the below example. We can use function in enum if we are returning the value from the function. It is used when the user needs to do any calculation. Suppose we need to calculate the total minutes like 1 hour = 60 minute, 2 hour = 120 minute, then it will create one function which will do a calcuation & return values to enum constant:
Example
function Totalminute(hr: number): any{
return 60 * hr;
}
enum hours
{
One = Totalminute(1) ,
Two = Totalminute(2),
Three = Totalminute(4),
}
console.log(hours.One);
console.log(hours.Two);
console.log(hours.Three);
Output
60
120
240
It is same as the numeric enums, we are just passing string values/literals to our enum constant. enum keyword is used to declare the enums.
Consider the below example, our vehicle is taking different kinds of turns, and we will define the enum as:
Example
enum vehicleTurn {
Left = "Left",
Right = "Right",
UTurn = "UTurn"
}
console.log(vehicleTurn.Left);
console.log(vehicleTurn.Right);
console.log(vehicleTurn.UTurn);
}
Output
Left
Right
UTurn
Typescript allows us to create a mixed type of enums.
This means we can assign numeric & string type values to enum.
Consider the below example, circleInfo has heterogeneous enum values.
Example
enum circleInfo {
Area = "area of circle",
Pie = 3.112,
Radius = 20
}
let result = circleInfo.Pie * circleInfo.Radius * circleInfo.Radius;
console.log(circleInfo.Area + " is :" + result);
Output
area of circle is :1244.8
Consider the below example, clothSize is enum which contains some constants. IClothSize is an interface which contains two properties, key & value, having string & number type respectively.
Function is taking enum as a parameter & will print the data on the console.
Example
enum clothSize {
small,
medium,
large
}
interface IClothSize {
key: string,
value: number
}
function getClothSize(size: clothSize): IClothSize {
switch (size) {
case clothSize.small:
return {
key: clothSize[clothSize.small], value: 10
};
case clothSize.medium:
return {
key: clothSize[clothSize.medium], value: 20
};
case clothSize.large:
return {
key: clothSize[clothSize.large], value: 30
};
}
}
console.log("cloth is " + getClothSize(clothSize.small).key + " & value is " + getClothSize(clothSize.small).value);
console.log("cloth is " + getClothSize(clothSize.medium).key + " & value is " + getClothSize(clothSize.medium).value);
Output
cloth is small & value is 10
cloth is medium & value is 20
Example
const enum myColor {
Red = 10,
White = Red * 4,
Blue = White + 10,
Yellow,
}
console.log(myColor.Red)
console.log(myColor.White)
console.log(myColor.Blue)
console.log(myColor['Yellow'])
Output
10
40
50
51
We will not be able to access enum using index in const enum like myColor[0], it will give us an error.
ES6 allows us to use map enum keys.
Example
enum classes {
I,
II,
III,
IV,
V
}
const ClassNames = new Map < number,
string > ([
[classes.I, '100'],
[classes.II, '200'],
[classes.III, '300'],
]);
console.log(ClassNames);
Output
Map(3) {0 => “100”, 1 => “200”, 2 => “300”}
We will modify the above example, we can use this into a classes as below.
Note
User can modify the code as per their requirement.
Example
enum classes {
I,
II,
III,
IV,
V
}
const ClassNames = new Map < number,
string > ([
[classes.I, '100'],
[classes.II, '200'],
[classes.III, '300'],
]);
class AllStandards {
public allNames: object;
constructor() {
this.allNames = ClassNames;
}
}
let obj: AllStandards = new AllStandards();
console.log(obj.allNames);
Output
Map(3) {0 => “100”, 1 => “200”, 2 => “300”}
We can declare the enum like this:
export enum sportActivities {Football, Cricket,Badminton, Tennis}
To import the enum in .ts, i.e.; typescript file looks like this:
import {sportActivities} from '../enums'
In this article, you learned about enum in Typescript. Thanks for reading!
#typescript #angular #Enum in Typescript