Template literals | Template strings

Template literals in ES6 (EcmaScript) allows us to embed expressions to our string literals. We can use multi-line strings and string interpolation features with them.

Template literals are enclosed by the back-tick (` `) instead of double or single quotes.

var message = `single line string`;
console.log(message);

// single line string

We can include place holders for string substitution using ${ } syntax

var expression = "place holder"; // string substitution
console.log(`this is a text with ${expression} in a line`);

// this is a text with place holder in a line

We can directly use expression interpolation to embed inline math

var a = 5;
var b = 5;

console.log(`the addition of a+b = ${a+b}`);
// the addition of a+b = 10

We can also call functions and use member functions in strings

function sample() { return "text from sample method"; }

console.log(`yes! ${sample()} and i am in uppercase`.toUpperCase());

// YES! TEXT FROM SAMPLE METHOD AND I AM IN UPPERCASE

The above code retrieves data from sample() method and converts it to uppercase in run-time.

Multiline Strings

We can achieve multi line strings, previously we used to insert new line character in our string

console.log(`First line
Second line`);
// First line 
// Second line

Raw strings

The special raw property, available on the first function argument of tagged template literals, allows you to access the raw strings as they were entered.

String.raw`Hi \n ${2+3}!`;
// "Hi \n 5!"

Tagged template literals

A more advanced form of template literals are tagged template literals. With them we able to modify the output of template literals using a function. The first argument contains an array of string literals. The second, and each argument after the first one, are the values of the processed substitution expressions. We can use any name to our function.

var a = 1;
var b = 2;

function tag(strings, ...values) {
 console.log(strings[0]); // "One "
 console.log(strings[1]); // " Two"
 console.log(strings[2]); // " Three"
 console.log(values[0]); // 1
 console.log(values[1]); // 2
}

tag`One ${ a } Two ${ b } Three`;

// One 
// Two 
// Three
// 1
// 2

Happy exploring EcmaScript 🙂

Angular 9 – YouTube Player Component

Embedding a YouTube video into your angular application isn’t a straight forward work before angular 9.

Before angular 8.2, it needs lots of efforts to embed and YouTube video.

You need an npm plugin to do the operation. Or you might need to iframe and a URL which is sanitized.

What new in Angular 9?

Angular Team tried to reduce the complexity of building a reusable components in angular 9.

They have released lots of interesting components/Module like ClipboardModule, Google maps, YouTube player component in the angular 9.

Earlier, we have discussed about copy to clipboard CDK in our website.

In this post, we are going to discuss on how to embed a YouTube video in angular application in quick steps.

How to render a YouTube video in angular application?

Step 1: Install the YouTube package

You install the YouTube player npm package with following command at the home directory of your application.

npm install @angular/youtube-player

Step 2: Import YouTube Player modules

Import the YouTube Player modules in to your app .module.ts (or you can import in your target module)

import { YouTubePlayerModule } from "@angular/youtube-player";

...

 imports: [
    ....,
    YouTubePlayerModule,
    ...
  ],

Step 3: Add YouTube Player component in HTML

We can add YouTube player component in our target component as below with the YouTube video ID.

We can easily get any id of and YouTube video. The ID of YouTube video will present in the URL itself.

Example:

https://www.youtube.com/watch?v=GYAB4Td62zI

In this URL, GYAB4Td62zI is the id of the video.

<youtube-player 
  videoId="GYAB4Td62zI" 
  suggestedQuality="highres" 
  [height]="250" 
  [width]="500" 
  [startSeconds]="4"
  [endSeconds]="8">
</youtube-player>

Parameters details

  • [videoId]: string — YouTube Video ID to render. It’s the little hash at the end of the YouTube URL. For example, if your video is found at https://www.youtube.com/watch?v=GYAB4Td62zI, then your videoId is GYAB4Td62zI.
  • [height]: number — height of video player
  • [width]: number — width of video player
  • [startSeconds]: number — the moment when the player is supposed to start playing
  • [endSeconds]: number— the moment when the player is supposed to stop playing
  • [suggestedQuality]:— the suggested quality of the player. This can take the values 'default' , 'small''medium''large''hd720''hd1080', and'highres'
  • [showBeforeIframeApiLoads]: boolean— whether the iframe will attempt to load regardless of the status of the API on the page. Set this to true if you don’t want the onYouTubeIframeAPIReady field to be set on the global window

Step 4: Import Youtube API script in index.html

<script src="https://www.youtube.com/iframe_api"></script>

Step 5: Run the code and see the magic

Step 0: Watch the demo and code

Demo

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