CODEWITHSUNDEEP
javascriptobjectjavascript-objects
wibberding
wibberding

Reputation: 835

How do I use a variable to choose which property of an object to search?

I downloaded some JSON which I've converted into an object. I now need to be able to search the second and third level deep and specify which property to search in a variable.

Here is my code attempt.

for (var j = 0; j < currentSnapshot.products.length; j++) {
        currentSnapshot.products[j].[firstLayer]; // Is this line kosher?
        if (secondLayer) {
            for (var i = 0; i < secondLayer.length; i++) {
                secondLayer[i]; // Do something.
            };
        };
    };

What is the best way to do this? Thanks for any help.

It looks the the for . . in with a .hasownproperty is what I'm looking for. How do you make this work for the second layer deep -- the properties of the properties?

Upvotes: 0

Views: 34

Answers (1)

JCOC611
JCOC611

Reputation: 19759

I'm not sure I understand your requirement, but I'll attempt to answer:

for (var j = 0; j < currentSnapshot.products.length; j++) {
    var secondLayer = currentSnapshot.products[j][firstLayer];
    if(secondLayer){
        for(var i = 0; i < secondLayer.length; i++) {
            secondLayer[i]; // Do something.
        };
    };
};

That is, assuming firstLayer already refers to a string which is the property you want to access. This is also assuming that currentSnapshot.products is an array of objects and secondLayer is also an array.

Also, notice I removed the period in between the square brackets in .products[j].[firstLayer], which is a syntax error.

Upvotes: 1

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