Ecma script version in iTowns

[gchoqueux]

Ecma script 6 in itowns

ITowns is written in ES6 and uses almost all its new features. (See all features). ITowns is transpiled in ES5 with Babel.

Important code rules, that aren't completely applied:

• [ ] Uses Class instead of object.
• [ ] Uses Set and Map instead of Array, when relevant.

Little used features, don't forget them :

• [ ] Array element finding

[ 1, 3, 4, 2 ].find(x => x > 3) // 4 
[ 1, 3, 4, 2 ].findIndex(x => x > 3) // 2

• [ ] String Searching

"hello".startsWith("ello", 1) // true 
"hello".endsWith("hell", 4)  // true 
"hello".includes("ell")  // true

• [ ] Number Safety Checking

Number.isSafeInteger(9007199254740992) === false

Ecma script 2016 in itowns see #932

• [x] exponentiation operator (**).
• [x] Array.prototype.includes.

Ecma script 2017

• [ ] Includes async/await. (Used in tests)

Ecma script 2018

• [ ] New features include rest/spread properties.
• [ ] Asynchronous iteration.
• [ ] Promise.prototype.finally() .
• [ ] additions to RegExp.

Ecma script 2019

What's new in Ecma script 2019

• [ ] Array.Flat()
• [ ] Object.fromEntries()
• [ ] Array.flatMap()
• [ ] String.trimStart() & String.trimEnd()
• [ ] Optional Catch Binding
• [ ] Function.toString()
• [ ] Well Formed JSON.Stringify()
• [ ] Array.Sort Stability

Ecma script 2020

What's new in Ecma script 2020

• [ ] Dynamic imports
• [ ] Import meta data
• [ ] New export syntax
• [ ] BigInt and arbitrary precision integers
• [ ] matchAll() method for regular expressions
• [ ] globalThis object
• [ ] Promise.allSettled() method
• [ ] nullish coalescing operator
• [ ] Optional chaining

Ecma script 2021

What's new in Ecma script 2021

• [ ] string.replaceAll method
• [ ] Private Methods
• [ ] Private Accessors
• [ ] Promise.any()
• [ ] Numeric Separators
• [ ] Logical Assignment Operator

Ecma script 2022

What's new in Ecma script 2022

• [ ] Top-level Await Operator
• [ ] Class Field Declarations
• [ ] Private Methods and Fields
• [ ] Static Class Fields and Private Static Methods
• [ ] Regexp Match Indices
• [ ] Ergonomic Brand Checks for Private Fields
• [ ] Array.at() Function for Indexing
• [ ] Scalable Object.prototype.hasOwnProperty()

[jailln]

Good idea.

I think that some of this information (e.g. use class instead of object, etc.) should be added in a to be created 'developer guide' (maybe in the wiki or in the docs folder? and pointed into the CONTRIBUTING.md file).

[zarov]

Thanks for creating this issue ! This can be a good first contribution for anyone wanting to contribute to iTowns.

@jailln yes, in fact the CONTRIBUTING file could be rewritten for a more up-to-date content. If you want to start a draft I'm all for it and then we can discuss it in a PR ?

[jailln]

@zarov yep, I'll start a draft in a new PR with propositions that came up while starting contributing to iTowns.