How to detect nearby players

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1

Hello, does anyone know how to detect all players near a player. For example, if a player presses a button, it will get all the nearby players within a certain radius, and it will damage them.

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2 
local function GetPlayersWithinDistance(from : Vector3, distance : number)
  local t = {}
  for _, v in pairs(game.Players:GetPlayers()) do
    if v.Character and v:DistanceFromCharacter(from) < distance then
      table.insert(t, v)
    end
  end
  return t 
end

print(GetPlayersWithinDistance(part.Position, 10)) -- prints all players within 10 studs of the part
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3 
local players = game:GetService("Players")

local function getCharactersWithinDistance(player, maxDistance)
	local foundCharacters = {}
	if not player then return end
	local character = player.Character
	if not character then return end
	
	for _, otherPlayer in ipairs(players:GetPlayers()) do
		if not otherPlayer then continue end
		local otherCharacter = otherPlayer.Character
		if not otherCharacter then continue end
		if not otherCharacter.PrimaryPart then continue end
		local distance = player:DistanceFromCharacter(otherCharacter.PrimaryPart.Position)
		if distance <= maxDistance then
			table.insert(foundCharacters, otherCharacter)
		end
	end
	
	return foundCharacters
end
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