How to address dynamic object keys

Question

I need to access object properties with dynamic keys which has persistent structure but different keys, like on one occasion it could be:

 var ty_tabs=[{
                "key1" :[{
                           "d1" : "v1",
                           "d2" : "v2",
                           "d3" : "v3"
                }],
                "key2" :[{
                           "d1" : "v1",
                           "d2" : "v2",
                           "d3" : "v3"
                }]
             }]

and on another one:

 var ty_tabs=[{
                "key3" :[{
                           "d1" : "v1",
                           "d2" : "v2",
                           "d3" : "v3"
                }],
                "key4" :[{
                           "d1" : "v1",
                           "d2" : "v2",
                           "d3" : "v3"
                }]
             }]

How do I adopt my code:

var b,a,d1,d2,d3;
for (b = 0 , a = ty_tabs.length; b < a ; ++b){
    d1 = ty_tabs[b].key1[0].d1;
    d2 = ty_tabs[b].key1[0].d2;
    d3 = ty_tabs[b].key1[0].d3;
}

To access properties with varying keys:

    d1 = ty_tabs[b].?[0].d1;
    d2 = ty_tabs[b].?[0].d2;
    d3 = ty_tabs[b].?[0].d3;

I have in JSON data ,array value as object as name array; this name array is dynamic value and this value have dynamic value. — neda zamani, Feb 13 '14 at 08:57

score 0 · Answer 1 · answered Feb 13 '14 at 08:50

If you don't know about the keys of an object, but need all keys present within an it, you can use Object.keys():

var b,a,d1,d2,d3, i, keys;
for (b = 0 , a = ty_tabs.length; b < a ; ++b){
    keys = Object.keys( ty_tabs[b] );

    for( i=0; i<keys.length; i++ ) {
      d1 = ty_tabs[b][ keys[i] ][0].d1;
      d2 = ty_tabs[b][ keys[i] ][0].d2;
      d3 = ty_tabs[b][ keys[i] ][0].d3;
    }
}

^{Object.keys() is rather well supported. For older versions of IE, you can use the polyfill provided at MDN}

How to address dynamic object keys

1 Answers1