JS objects: how to Dynamically name members when adding properties

Question

I'm trying to create new object member with a dynamically created string as the member name:

  > obA = {};
  > obb = {name:'jim', age:22};
  > var s = new String(obb.name);
  > obb;                       //{ name: 'jim', age: 22 }
  > obA.s = obb;               //{ name: 'jim', age: 22 }
  > obc = {name:'don', age:23};
  > var c = new String(obc.name);
  > obA.c = obc;
  > obA;
        outputs the folowing
             { s: { name: 'jim', age: 22 },
               c: { name: 'don', age: 23 } }

In this example I would like to add members 'jim' and 'don' to obA, not 's' and 'c'. Instead my calls above add members 's' and 'c'. Is there some way to dynamically name the members so that I can add 'jim' and 'don' at runtime without knowing the member names ahead of time. What I want from in the above example from 'obA' at the end is:

  > obA;
   // should output
        { jim: { name: 'jim', age: 22 },
          don: { name: 'don', age: 23 } }

alex · Accepted Answer · 2012-03-18 20:46:56Z

3

Use bracket notation.

obj['property'] = value;

answered Mar 18, 2012 at 20:46

alex

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taskinoor · Accepted Answer · 2012-03-18 20:49:34Z

2

Try [] instead of dot.

obA[s] = obb;
obA[c] = obc;

answered Mar 18, 2012 at 20:49

taskinoor

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Comments

Peter Lyons · Accepted Answer · 2012-03-18 20:51:09Z

1

obA[obb.name] = obb;
obA[obc.name] = obc;

answered Mar 18, 2012 at 20:51

Peter Lyons

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1 Comment

JJRutter Over a year ago

Thanks, exactly what I wanted.

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