Modern java script features

Jun 18, 2019Download as PPTX, PDF0 likes244 views

Kunal Kursija

These are the slides supporting my talk at DrupalCamp Delhi 2019 on the topic Modern JavaScript Features.

Kunal Kursija
Mumbai, Maharashtra India
Drupal Developer @ Axelerant
Drupal: https://www.drupal.org/u/kunalkursija
LinkedIn: https://in.linkedin.com/in/kunalkursija

JavaScript
• A Scripting Language that was initially created to run on web browsers.
• Applications:

JavaScript Engine
• It’s a program that understands and executes the JavaScript code.
• Examples:
• Chrome: V8
• Mozilla: SpiderMonkey
• Microsoft: Chakra
• FitBit: JerryScript

ECMAScript
• ECMAScript is a standard created by ECMA International.
• JavaScript engines across the world stick to follow ECMAScript as a standard.

JavaScript vs ECMAScript
• JavaScript is the best known Implementation of ECMAScript.
• You know ECMAScript standards/specifications - You know how to create a scripting language.
• You know JavaScript - You know how to use a scripting language.

ECMAScript Versions
Version Name Year
ES1 1997
ES2 1998
ES3 1999
ES5 2009
ES6 (ES2015) 2015
ES7 (ES2016) 2016
ES8 (ES2017) 2017
ES9 (ES2018) 2018
ES10 (ES2019) 2019 (yet to be released)

var
Scope Declaration - Assignment - Redeclaration Hoisting

let
Scope Declaration - Assignment - Redeclaration Hoisting

const
Scope Declaration - Assignment - Redeclaration Hoisting

Template Literals
• Template literals are strings that
allows embedding of expressions into
strings.
• We use back-tick(`) and not single
quotes(‘) or double quotes(“).
• Multi-lines work.

Array Destructuring
Array Destructuring is a JavaScript expression that makes it possible to unpack values from arrays into
distinct variables.
ES5 ES6

Object Destructuring
Object Destructuring is a JavaScript expression that makes it possible to unpack values from objects into
distinct variables.
ES5 ES6

Spread Operator
Spread parameter can be used to expand the the values of an array.
ES5
ES6

Rest Parameter
● The Rest Parameter syntax allows us to represent an indefinite number of arguments as an array.
● Rest parameter must always be at the end.
ES5 ES6

Modules
• Exporting Modules = Making some functionality available for other modules to use.
• Importing Modules = Reusing some functionality provided by other modules.
export.js import.js

Promises
• The Promise is an object, Which represents the eventual completion (or failure) of an asynchronous
operation, and its resulting value.

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Modern java script features

1. Modern JavaScript Features @kunalkursija

2. Kunal Kursija Mumbai, Maharashtra India Drupal Developer @ Axelerant Drupal: https://www.drupal.org/u/kunalkursija LinkedIn: https://in.linkedin.com/in/kunalkursija

3. Some Terminologies…

4. JavaScript • A Scripting Language that was initially created to run on web browsers. • Applications:

5. JavaScript Engine • It’s a program that understands and executes the JavaScript code. • Examples: • Chrome: V8 • Mozilla: SpiderMonkey • Microsoft: Chakra • FitBit: JerryScript

6. ECMAScript • ECMAScript is a standard created by ECMA International. • JavaScript engines across the world stick to follow ECMAScript as a standard.

7. JavaScript vs ECMAScript • JavaScript is the best known Implementation of ECMAScript. • You know ECMAScript standards/specifications - You know how to create a scripting language. • You know JavaScript - You know how to use a scripting language.

8. ECMAScript Versions Version Name Year ES1 1997 ES2 1998 ES3 1999 ES5 2009 ES6 (ES2015) 2015 ES7 (ES2016) 2016 ES8 (ES2017) 2017 ES9 (ES2018) 2018 ES10 (ES2019) 2019 (yet to be released)

9. And, Modern JavaScript Features…

10. var Scope Declaration - Assignment - Redeclaration Hoisting

11. let Scope Declaration - Assignment - Redeclaration Hoisting

12. const Scope Declaration - Assignment - Redeclaration Hoisting

13. Template Literals • Template literals are strings that allows embedding of expressions into strings. • We use back-tick(`) and not single quotes(‘) or double quotes(“). • Multi-lines work.

14. Arrow Functions ES6 ES5

15. Array Destructuring Array Destructuring is a JavaScript expression that makes it possible to unpack values from arrays into distinct variables. ES5 ES6

16. Object Destructuring Object Destructuring is a JavaScript expression that makes it possible to unpack values from objects into distinct variables. ES5 ES6

17. Spread Operator Spread parameter can be used to expand the the values of an array. ES5 ES6

18. Rest Parameter ● The Rest Parameter syntax allows us to represent an indefinite number of arguments as an array. ● Rest parameter must always be at the end. ES5 ES6

19. Classes and Inheritance

20. Modules • Exporting Modules = Making some functionality available for other modules to use. • Importing Modules = Reusing some functionality provided by other modules. export.js import.js

21. Promises • The Promise is an object, Which represents the eventual completion (or failure) of an asynchronous operation, and its resulting value.

22. Questions? 22

23. Thank You! 23

Modern java script features

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