[Solved] How to generate asscoiate array of objects in javascript?

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A couple of corrections to your original function ought to do it.

var output = {}; // empty object
$.each(fruits, function (index, fruit)
{
    var key = fruit.id;
    // check property exists otherwise initialize it
    if (!output[key]) output[key] = [];
    output[key].push(fruit);
});

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solved How to generate asscoiate array of objects in javascript?