EcmaScript

EcmaScript is the standard name for JavaScript (ECMA-262).

This is the main history of the versions:

• ECMAScript 3 (December 1999) Used for 10 years.

• ECMAScript 4 (Abandoned)

• ECMAScript 5 (December 2009)

• ES2015 a.k.a. ES6 (class, arrow functions, spread, Promise …)

• ES2016 a.k.a. ES7 (…)

• ES2017 a.k.a. ES8 (…)

• ES2018 a.k.a. ES9 (…)

• ES2019 a.k.a. ES10 (…)

• ES2020 a.k.a. ES11 (Optional chaining, Nullish Coalescing, dynamic import)

In order use new standards, before 2014/2015, the applications had to wait the updates of the internet browsers from the users, that was not automatic like in the most modern ones.

Many stakeholders from 2014/2015 started pushing for new features, helped by transpilers (source-to-source compilers) like Babel, that allowed to use new language features and extensions and have their code converted to a version compatible with most of the browsers.

In this section we will see the main new features of ECMAScript that are frequently used in MapStore.

Note

This is not a full course of ECMAScript 6 to 11. For the full set of the new features of ECMAScript, you can check the W3C site

Contents:

• ES2015 (ES6)
  • Variable declaration
  • Functions
  • Object initialization
  • Spread operator
  • Destructuring assignment
  • Classes
  • Promise
• ES2020 (ES11)
  • Optional Chaining
  • Nullish Coalescing