Iterating over an array Vs Mapping solidity

Question

Which of the two is more efficient. Assuming I have this,

uint[] public availableRooms = [1,2,3,4,5,6,7]; 

And I need to know whether 5 is present in the array above. Which of the two is more efficient and can you help with how to do that with mapping?

Edit.

Based on the comments by users, a mapping will be the best way to find out if an element exists or not. So I changed the code into something like this

mapping (uni256 => bool); 

And in the constructor function, I constructor all instances of my availableRooms

constructor (){
availableRooms[1] = true;
availableRooms[2] = true;
availableRooms[3] = true;
availableRooms[4] = true;
availableRooms[5] = true;
availableRooms[6] = true;
availableRooms[7] = true;
}

And now to find out if the room really exist, all I have to do is

availableRooms[5] ; 

Answer 1

Yeah you can do this easy with a map.

mapping(uint8 => bool) public availableRooms;

uint8 is a number of the room. bool is a false/true , depending on if the room is available.

If you want to check if room number 5 is available you just need to call the map.

availableRooms [5]; //And you will get true or false