javascript - How to dynamically grab the first available number in a loop? -

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been going @ while, figured i'd post here help.

items = { '417': { a: 23, slot_position: 13 },   '419': { a: 28, slot_position: 2 },   '420': { a: 29, slot_position: 12 },   '421': { a: 29, slot_position: 3 },   '424': { a: 31, slot_position: 17 },   '425': { a: 32, slot_position: 7 },   '428': { a: 35, slot_position: 0 },   '429': { a: 36, slot_position: 0 },   '431': { a: 42, slot_position: 0 },   '432': { a: 40, slot_position: 0 },   '433': { a: 43, slot_position: 11 },   '434': { a: 44, slot_position: 0 },   '435': { a: 45, slot_position: 0 },   '436': { a: 47, slot_position: 0 },   '437': { a: 48, slot_position: 15 },   '438': { a: 48, slot_position: 1 },   '439': { a: 48, slot_position: 0 },   '440': { a: 48, slot_position: 14 },   '441': { a: 43, slot_position: 0 },   '442': { a: 44, slot_position: 0 },   '443': { a: 43, slot_position: 8 },   '444': { a: 37, slot_position: 0 },   '445': { a: 37, slot_position: 0 },   '446': { a: 37, slot_position: 0 },   '447': { a: 37, slot_position: 16 },   '451': { a: 50, slot_position: 5 },   '452': { a: 49, slot_position: 6 },   '453': { a: 39, slot_position: 20 },   '454': { a: 38, slot_position: 4 },   '455': { a: 19, slot_position: 19 },   '456': { a: 49, slot_position: 9 },   '457': { a: 51, slot_position: 0 } };  inventory_slots = 30; used_slots = []; for(a in items){     if(items[a].slot_position > 0){        used_slots.push(items[a].slot_position);     } }   console.log(used_slots);

see on jsfiddle: http://jsfiddle.net/sf71l5jq/6/

so, user has 30 available inventory slots. , above console logs array:

[13, 2, 12, 3, 17, 7, 11, 15, 1, 14, 8, 16, 5, 6, 20, 4, 19, 9]

how go finding first open number (slot)? in case, should 10. how accomplish dynamically?

edit: @tim lewis's idea here: http://jsfiddle.net/sf71l5jq/8/ doesn't catch correct number. (note: not saying idea wrong, it's code).

for(i=1; < inventory_slots; i++){     if(used_slots[i] != i){         first_open = used_slots[i];  // why first_open assigned '2'?         break;     } }

first of all, values need sorted in numeric order:

used_slots.sort(sortnumber);  function sortnumber(a, b){     return - b; }

next, loop through using counter , find first index doesn't match counter:

for(i = 0; < inventory_slots; i++){     if(used_slots[i] != i+1){         first_open = i+1;           break;     } } console.log(first_open); // 10

in case, first open slot 10. note, index starts @ 0, not 1, slot numbers start @ 1, explains comparison if(used_slots[i] != i+1) , assignment first_open = i+1;


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