ES5/6/7/8/etc wishlist

[gfwilliams]

ES5/ES6 features that aren't in Espruino but that would be useful... I'll do one post per feature, and please use the add reaction button to vote on each one.

[gfwilliams]

• String.startsWith/endsWith/includes - would be trivial to add

[gfwilliams]

• Proper let implementation - it's just treated as var at the moment, but nobody seems to actually care (Correct implementation of LET and CONST keywords #971)

[gfwilliams]

• Proper const implementation - it's just treated as var at the moment (Correct implementation of LET and CONST keywords #971)

[gfwilliams]

• Array.find/findIndex - find by executing a function for comparison

[gfwilliams]

• JS classes - probably not too painful, and seems like it'd tidy up a lot of code

[gfwilliams]

• Default argument values

Right now we store function arguments in their own variables in the function:

>function test(a,b) { print(a,b); }
=function (a,b) { ... }
>trace(test)
#1448[r1,l1] Function {
  #1273[r1,l2] Name Param "\xFFa"     undefined
  #1177[r1,l2] Name Param "\xFFb"     undefined
  #1508[r1,l2] Name String [1 blocks] "\xFFcod"    #1516[r1,l0] String [2 blocks] "print(a,b);"
}

Potentially if we stored them as a single string it'd be more memory efficient in all but the single-argument case, and would allow us to have default arguments, eg a,b=42

[gfwilliams]

• Array.includes - easy, just indexOf()>=0

[gfwilliams]

• Object.entries and Object.values

[gfwilliams]

• String.padStart/padEnd (05c89c9)

[gfwilliams]

• async/await - although this it likely too difficult to implement in Espruino as it is

[gfwilliams]

• getters and setters (5aad237)

[FlowerOfLife]

• Arrow functions to bind "this"

[gfwilliams]

• Destructuring

[gfwilliams]

• Rest and Spread