Recursive loop until we're done with the object [JS]

Question

I"m building a plugin for Photoshop, which is based on layers. To do this, I need to build an array with each layer which returns true when going through a function (checking the name for matches).

How could I basically "recursively" go through the object, and child objects, until I've been through everything? (Putting "selected" items in an array in the process).

The object is just a plain javascript object, with tons of objects in it (and further more inside it).

Is the problem that you're generally unfamiliar with recursion and want to know how to do it? — ori
– ori, Commented Feb 17, 2012 at 16:46
I'd have to say yes - I really don't have a clue how I'd do this. — user825286
– user825286, Commented Feb 17, 2012 at 16:50
Have you tried searching for the answer on StackOverflow? I did a quick search, and found lots of similar questions. — user1106925
– user1106925, Commented Feb 17, 2012 at 17:16

gztomas · Accepted Answer · 2012-02-17 17:05:21Z

1

Try this:

var isASelectedLayer = function(element) {
    ...
}
var objectWithLayers = {...}

var selected = [];
var lookForSelectedLayers = function(o) {
    for(element in o) {
        if(isASelectedLayer(o[element]))
            selected.push(o[element]);
        else
            lookForSelectedLayers(o[element]);
    }
};
lookForSelectedLayers(objectWithLayers);

answered Feb 17, 2012 at 17:05

gztomas

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Frank van Puffelen · Accepted Answer · 2012-02-17 17:05:34Z

1

Something like this, but it's missing lots of checks for now:

function showProperties(object, prefix) {
    if (typeof prefix == "undefined") prefix = "";
    var result = ""
    for (property in object) {
        result += prefix + property+"="+object[property]+" "+typeof object[property]+"\n";
        if (typeof object[property] == "object") {
            result += showProperties(object[property], prefix+"  ");
        }
    }
    return result;
}

answered Feb 17, 2012 at 17:05

Frank van Puffelen

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