Reply To: Choosing subet of items to present

[Jeremy]

Hi Sam,

There probably are more optimal implementations, but how about this:

const NBLOCKS = 24;
const NITEMSPERBLOCK = 12;

const blocks = {};
const addItem = type => {
    if (!blocks.hasOwnProperty(type))
        blocks[type] = [...new Array(NBLOCKS)].map((v,i)=>Object({id:i, n:0}));
    let freeblocks = blocks[type].filter(v=>v.n<NITEMSPERBLOCK);
    if (!freeblocks.length) return console.error("# of items in table does not match config");
    let r = Math.floor(Math.random()*freeblocks.length);
    freeblocks[r].n++;
    return type+"-"+freeblocks[r].id;
}

Sequence(
    rshuffle("Test-0","Train-0"),"pause",
    rshuffle("Test-1","Train-1"),"pause",
    rshuffle("Test-2","Train-2"),"pause",
    rshuffle("Test-3","Train-3"),"pause",
    rshuffle("Test-4","Train-4"),"pause",
    rshuffle("Test-5","Train-5"),"pause",
    rshuffle("Test-6","Train-6"),"pause",
    rshuffle("Test-7","Train-7"),"pause",
    rshuffle("Test-8","Train-8"),"pause",
    rshuffle("Test-9","Train-9"),"pause",
    rshuffle("Test-10","Train-10"),"pause",
    rshuffle("Test-11","Train-11"),"pause",
    rshuffle("Test-12","Train-12"),"pause",
    rshuffle("Test-13","Train-13"),"pause",
    rshuffle("Test-14","Train-14"),"pause",
    rshuffle("Test-15","Train-15"),"pause",
    rshuffle("Test-16","Train-16"),"pause",
    rshuffle("Test-17","Train-17"),"pause",
    rshuffle("Test-18","Train-18"),"pause",
    rshuffle("Test-19","Train-19"),"pause",
    rshuffle("Test-20","Train-20"),"pause",
    rshuffle("Test-21","Train-21"),"pause",
    rshuffle("Test-22","Train-22"),"pause",
    rshuffle("Test-23","Train-23")
)

newTrial("pause", newButton("Take a break").print().wait() )

Template( "myTable" , row =>
    newTrial( addItem(row.Type) ,
        newButton(row.Word).print().wait()
    )
)

This will randomly assign each of the items from your table to one of 24 (NBLOCKS) type-specific blocks of 12 (NITEMSPERBLOCK) items each. You can then write a Sequence where you randomly shuffle the items in those randomly-generated blocks, and separate each block by a pause trial.

Jeremy