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Asked: 2026-05-15T20:59:44+00:00

I have some JSON objects I’d like to store in a map for the

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I have some JSON objects I’d like to store in a map for the lifetime of my app. For example, my app shows a listing of Farms. When a user clicks one of the Farm links, I download a Farm representation as JSON:

Farm 1
Farm 2
...
Farm N

every time the user clicks one of those links, I download the entire Farm object. Instead, I’d like to somehow make a global map of Farms, keyed by their ID. Then when the user clicks one of the above links, I can see if it’s already in my map cache and just skip going to the server.

Is there some general map type like this that I could use in jquery?

Thanks

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1 Answer

  1. Editorial Team

    What about a JavaScript object?

    var map = {};

map["ID1"] = Farm1;
map["ID2"] = Farm2;
...

    Basically you only have two data structure in JavaScript: Arrays and objects.

    And fortunately objects are so powerful, that you can use them as maps / dictionaries / hash table / associative arrays / however you want to call it.

    You can easily test if an ID is already contained by:

    if(map["ID3"]) // which will return undefined and hence evaluate to false
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