set nested object propery by dynamic array

Question

I have an object

 obj = { a: 1, b: { c: 1,  g: x, h: { j: {k: z} } } };

if I have an array of dynamic length ["a", "b", [...], "g" ]

How can I now update a.b.c.g ?

example:

function set($target, $new_value, $array){
    //magic
} 

set(obj, y, ['b', 'g']);
// obj is now { a: 1, b: { c: 1, [...] g: **y**, h: { j: {k: z} } } }; 

set(obj, y, ['b', 'h', 'j', 'k']);
// obj is now { a: 1, b: { c: 1, [...] g: y, h: { j: {k: **y**} } } };

function set($obj, $val, $arr){ for(var i:uint = 0; i < $arr.length-1; i++){ $obj = $obj[$arr[i]]; } $obj[$arr.pop()] = $val; } — nizzle
– nizzle, Commented Jan 30, 2012 at 12:32

Valentin Simonov · Accepted Answer · 2012-01-30 12:39:01Z

2

function setObj(target:Object, newValue:Object, path:Array):void {
  for ( var i:uint = 0; i < path.length-1; i++ ) {
    target = target[path[i]];
    if ( target == null ) return;
  }
  target[path[path.length-1]] = newValue;
}

var o:Object = {a: 1, b: { d: 42, e: {f: 7, g: 8}}, c: 3};
trace( o.b.e.f );
setObj(o, "bla", ["b", "e", "f"]);
setObj(o, "42", ["a"]);
trace( o.b.e.f );
trace( o.b.e.g );
trace( o.a );

Copy this code and try to understand how it works. Hope it helped.

answered Jan 30, 2012 at 12:39

Valentin Simonov

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