JavaScript - Shuffling Objects inside an object (randomize)

Question

I need to implement a randomization from JSON result.

The format of the JSON is two objects:

result:

Question(object)

[Object { id="4c6e9a41470b19_96235904",  more...}, 
 Object { id="4c784e6e928868_58699409",  more...}, 
 Object { id="4c6ecd074662c5_02703822",  more...}, 6 more...]

Topic(object)

[Object { id="3jhf3533279827_23424234",  more...}, 
 Object { id="4634663466cvv5_43235236",  more...}, 
 Object { id="47hf3892735298_08476548",  more...}, 2 more...]

I want to randomize the order of the objects inside the question object and the topic objects.

Answer 1

You could use a Fisher-Yates-Durstenfeld shuffle:

var shuffledQuestionArray = shuffle(yourQuestionArray);
var shuffledTopicArray = shuffle(yourTopicArray);

// ...

function shuffle(sourceArray) {
    for (var i = 0; i < sourceArray.length - 1; i++) {
        var j = i + Math.floor(Math.random() * (sourceArray.length - i));

        var temp = sourceArray[j];
        sourceArray[j] = sourceArray[i];
        sourceArray[i] = temp;
    }
    return sourceArray;
}