How I can do it?

[DrackNife]

command /swp [<text>] [<text>]:
    aliases: /skywarsplus
    executable by: players
    trigger:
        if arg 1 is "create":
            if arg 2 is set:
                add arg 2 to {swp.arena::*}
                send "&aArena ""%arg-2%"" created!"
            else:
                send "&4Write a name of arena."
        else if arg 1 is "setmainlobby":
            if {swp.arena::*} has arg 2: #Here!
                send "&aworking!"

How I can specify an item of list variable ?

 

[ShaneBee]

command /swp [<text>] [<text>]:
    aliases: /skywarsplus
    executable by: players
    trigger:
        if arg 1 is "create":
            if arg 2 is set:
                add arg 2 to {swp.arena::*}
                send "&aArena ""%arg-2%"" created!"
            else:
                send "&4Write a name of arena."
        else if arg 1 is "setmainlobby":
            if {swp.arena::*} has arg 2: #Here!
                send "&aworking!"

How I can specify an item of list variable ?

You can use

if {swp.arena::*} contains arg 2

However that has never worked for me (idk if it works for you or other people) so this is what i use

loop {swp.arena::*}:
    if loop-value is arg 2:

 

[ShaneBee]

You can use

if {swp.arena::*} contains arg 2

However that has never worked for me (idk if it works for you or other people) so this is what i use

loop {swp.arena::*}:
    if loop-value is arg 2:

contains on lists variables isn't reliable, here's a function you can use instead

function contains(l: objects, v: object) :: boolean:
  return not (random element out of ({_l::*} where [object input is {_v}]) == null)

 

[ShaneBee]

contains on lists variables isn't reliable, here's a function you can use instead

function contains(l: objects, v: object) :: boolean:
  return not (random element out of ({_l::*} where [object input is {_v}]) == null)

I don't know how execute it or how put in my code ;-;