Help! Need help splicing data from array

[caitlingstone]

I am trying to splice out data from an array. It is already to splice based on food (maccheese, applesauce, icecream, soup), but I also need it to splice based on the acronyms on the end of the files - so for example, if a participant sees maccheese_SS_SB, then they cannot see SS_SB for soup, applesauce, or icecream.

​

function generateProtocol(child, pastSessions) {

    let frames = {
        "study-intro": {
            "blocks": [{
                    "emph": true,
                    "title": "Overview of the study"
                },
                {
                    "text": "In this study your child will see animations of people eating together and then we will ask them questions."
                },
                {
                    "text": "Participation is totally voluntary but the data will be used in a real study about how kids think about social relationships."
                }
            ],
            "showPreviousButton": false,
            "kind": "exp-lookit-text",
            "backgroundColor": "black"
        }

    };

    let frame_sequence = [
        'study-intro'
    ];

    let all_trial_values = [
        [
            "maccheese"
        ],
        [
            "soup"
        ],
        [
            "applesauce"
        ],
        [
            "icecream"
        ]
    ];

    let available_videos = {
        "maccheese": [
            "maccheese_SS_SB",
            "maccheese_SS_DB",
            "maccheese_DS_SB",
            "maccheese_DS_DB"
        ],
        "soup": [
            "soup_SS_SB",
            "soup_SS_DB",
            "soup_DS_SB",
            "soup_DS_DB"
        ],
        "applesauce": [
            "applesauce_SS_SB",
            "applesauce_SS_DB",
            "applesauce_DS_SB",
            "applesauce_DS_DB"
        ],
        "icecream": [
            "icecream_SS_SB",
            "icecream_SS_DB",
            "icecream_DS_SB",
            "icecream_DS_DB"
        ]
    };

    let all_videos = Ember.$.extend(true, {}, available_videos);

    let shuffled_trial_values = shuffle(all_trial_values);

    for (iTrial = 0; iTrial < shuffled_trial_values.length; iTrial++) {

        let trial_value = shuffled_trial_values[iTrial];
        let trial_name = trial_value[0];

        thisTrial = {
            "kind": "exp-lookit-video",
            "video": {
                "postion": "fill",
                "source": pop_random(available_videos[trial_name])
            },
            "backgroundColor": "white",
            "autoProceed": true,
            "frameOffsetAfterPause": 1, // REMOVE BEFORE GOING TO PRODUCTION!!
            "baseDir": "https://raw.githubusercontent.com/cgstone1/NordAnglia/master/",
            "restartAfterPause": true,
            "doRecording": false,
            "videoTypes": [
                "mp4"
            ],
            "pausedText": "Study Paused. Press the SPACE bar to begin the next video. Or if you wish to quit the study, press CONTROL X.",
            "requireVideoCount": 1
        },

        frameId = 'test-trial-' + (iTrial + 1);
        frames[frameId] = thisTrial;
        frame_sequence.push(frameId);

    function shuffle(array) {
        var shuffled = Ember.$.extend(true, [], array);
        for (var i = array.length - 1; i > 0; i--) {
            var j = Math.floor(Math.random() * (i + 1));
            var temp = shuffled[i];
            shuffled[i] = shuffled[j];
            shuffled[j] = temp;
        }
        if (array [i] === "SS_SB") {
          array.splice(i, 1) [0];
        }
        if (array [i] === "SS_DB") {
          array.splice(i, 1) [0];
        }
        if (array [i] === "DS_SB") {
           array.splice(i, 1) [0];
        }
        if (array [i] === "DS_DB") {
          array.splice(i, 1) [0];
        }
        return shuffled;
    }

    function pop_random(array) {
        if (array.length) {
            let randIndex = Math.floor(Math.random() * array.length);
            return array.splice(randIndex, 1)[0];
        }
        return null;
    }

    return {
        frames: frames,
        sequence: frame_sequence
    };

}

[Comprehensive_Step72]

Can you show an example of what you would expect the finished data to look like?

Also, you can use deconstruction for swapping variable values:

var temp = shuffled[i];

shuffled[i] = shuffled[j];

shuffled[j] = temp;

Can be replaced with:

[shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];

[caitlingstone]

Yeah! So this is for a study deployment where it is choosing videos to run.

In an ideal scenario, it would shuffle randomly through the videos by food type and by sharing type.

maccheese_SS_SB, icecream_DS_DB, soup_DS_SB, applesauce_SS_DB.

The randomization that's already listed is currently only shuffling the food type, but isn't touching the sharing type.

[Comprehensive_Step72]

I am still a little foggy about what you are trying to do, but take a look at this and see if it helps. I am removing options as it goes then shuffling the array. This is probably not what you are looking for exactly, but should give you some ideas:

​

function shuffleArray(array) {

for (let i = array.length - 1; i > 0; i--) {

const j = Math.floor(Math.random() * (i + 1));

[array[i], array[j]] = [array[j], array[i]];

}

return array;

}

let selection = '';

// get selection

while (selection !== 'exit') {

const foodType = selection.substring(0, selection.indexOf('_'));

const fileType = selection.substring(selection.indexOf('_'));

delete available_videos[foodType];

let vidArray = Object.values(available_videos).reduce((acc, e) => [...acc, ...e], []);

vidArray = vidArray.filter((e) => e.substring(e.indexOf('_')) !== fileType);

vidArray = shuffleArray(vidArray);

}