Set a variable of a random player to true

[moritzMSN]

I dont know how i can do that

on join:
    set {bed.%player%} to true
    set {team.attacker.%player%} to false
    set player's gamemode to survival
    heal player
    set hunger to 20
    clear player's inventory
    add 1 to {slots}
    wait 1 tick
    teleport player to {lobby}
    if {slots} is 1:
        set {team.attacker.%player%} to true
    else:
        loop all players:
            if {team.attacker.%loop-player%} is false:
                add 1 to {_size}
                if {_size} is 2:
                    add loop-player to {_players::*}
                    set {_size} to size of {_players::*}
                    set {_x} to a random integer between 1 and {_size}
                    set {team.attacker.%{_x}%} to true

 

[PatoFrango]

set {_player} to random player out of all players
set {team.attacker.%{_player}%} to true

This?