set type

[pomid]

Describe the feature

builtin set type like python set
can emulate it with map[T]V but having a separate set would be useful and will not waste resources

Use Case

sets have many use cases ....
you can almost build everything with them @

Proposed Solution

mut a := set[int]{0,1,2}
0 in a // true
3 in a // false
a << 3 // add 3 to a
3 in a // true

for i in a{
    println(i)
}

// alternative declarations:
a := {0,1,2} // implied type of set[int]
a := {
    0
    1
    2
} // implied type of set[int]
a := set int{0,1,2}
a := set {
    0
    1
    2
}

Other Information

also when tried to use none as map value i get C error
mut a := map[int]none{}
a[0] = none // error: C:/Users/pomid/AppData/Local/Temp/v_0/mmp.8507532903023194351.tmp.c:12695: error: cannot convert 'extern struct IError' to 'unsigned char'
is this intended ?

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

V 0.4.2 c947c14

Environment details (OS name and version, etc.)

V full version: V 0.4.2 c947c14
OS: windows, Microsoft Windows 10 Pro v19045 64-bit
Processor: 8 cpus, 64bit, little endian,

getwd: C:\Users\pomid\Desktop\v
vexe: C:\v\v.exe
vexe mtime: 2023-10-15 10:07:34

vroot: OK, value: C:\v
VMODULES: OK, value: C:\Users\pomid.vmodules
VTMP: OK, value: C:\Users\pomid\AppData\Local\Temp\v_0

Git version: git version 2.41.0.windows.1

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[Delta456]

We already have sets in the language via datatypes module.

Plus I am sure you cannot have none as value initialisation like that.