Question

Im using this ‘map’ on js:

   var myMap = new Object();
   myMap[key1]=value1; //like this n times...

but i want to use the key as some combination of two strings meaning:

  function getMapValue(str1,str2){...}

i dont mind joining the two strings into one long string and use the function with the long string

any ideas?

Answer 1

You can make a map of maps (just be sure to check that the intermediate map exists when accessing it)

var myMap = {}; //dont use "new Object()". It is evil.

function insert(k1, k2, v){
   if(!(k1 in myMap)){ myMap[k1] = {}; }
   myMap[k1][k2] = v;
}

function get(k1, k2){
   return myMap[k1] && myMap[k1][k2];
}

And if you want to join two substrings into a single one you can use the plus operator to concatenate things.

var customKey = k1 + '|' + k2;

Just be sure your separator can’t be used in a normal key to avoid conflicts.