Multi-dimensional associative arrays in JavaScript -

there following query results: (key1 , key2 text)

id   key1     key2     value  1    fred     apple    2 2    mary     orange   10 3    fred     banana   7 4    fred     orange   4 5    sarah    melon    5 ... 

and wish store data in grid (maybe array) looping records this:

         apple    orange   banana  melon fred        2        4         7     - mary        -        10        -     - sarah       -        -         -     5 

in php easy, using associative arrays:

$result['fred']['apple'] = 2; 

but in javascript associative arrays doesn't work. after reading tons of tutorial, this:

arr=[]; arr[1]['apple'] = 2; 

but arr['fred']['apple'] = 2; doesn't work. tried arrays of objects, objects properties can't free text. more reading tutorials, more got confused...

any idea welcome :)

just use regular javascript object, 'read' same way associative arrays. have remember initialize them first well.

var obj = {};  obj['fred'] = {}; if('fred' in obj ){ } // can check presence of 'fred' if(obj.fred) { } // checks presence of 'fred' if(obj['fred']) { } // checks presence of 'fred'  // following statements work obj['fred']['apples'] = 1; obj.fred.apples = 1; obj['fred'].apples = 1;  // or build or initialize structure outright var obj = { fred: { apples: 1, oranges: 2 }, alice: { lemons: 1 } }; 

if you're looking on values, might have looks this:

var people = ['fred', 'alice']; var fruit = ['apples', 'lemons'];  var grid = {}; for(var = 0; < people.length; i++){     var name = people[i];     if(name in grid == false){         grid[name] = {}; // must initialize sub-object, otherwise 'undefined' errors     }      for(var j = 0; j < fruit.length; j++){         var fruitname = fruit[j];         grid[name][fruitname] = 0;     } }