How to chain methods in javascript?

Question

Assuming I have the following object.

myobj = {
    'item1'{'key1':'value1'},
    'item2'{'key2':'value2'}
}

How can I define a function such that I could call:

var value = getMyObjItem('item2').getValue();

in order to get 'value2'? I would like to avoid defining a 'getItem' (takes item parameter) and 'getItemByValue' (takes two parameters of item and key).

First of all, your original javascript is invalid. It should have ":" between the items and the {}. Then you can access the objects directly. e.g. var test = myobj.item2.key2 - jsfiddle.net/USD8f — Nick Grealy
– Nick Grealy, Commented Jan 15, 2014 at 4:34

1252748 · Accepted Answer · 2016-01-18 15:53:05Z

1

It wasn't clear what you wanted, but I did the best I could with the information I had. The following function operates in the exact manner you asked for, and is probably a good example of giving you what you asked for rather than what you needed. Nonetheless:

myobj = {
    'item1': {'key1':'value1'},
    'item2': {'key2':'value2'}
};

function getMyObjItem(key) {
    return {
        value: myobj[key]["key" + key.replace("item", "")],
        getValue: function() {
            return this.value;
        }
    };
}

var value = getMyObjItem('item2').getValue(); // will return "value2"

Note that this will only work if you maintain the exact property scheme that you demonstrated in the example.

edited Jan 18, 2016 at 15:53

1252748

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answered Jan 15, 2014 at 4:35

Elliot Bonneville

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1252748 Over a year ago

Can you explain a little bit exactly how this works? How is value called here? Thanks!

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