as seen in our discussion you do not need this value

Here you are modifying the source itself, this means that next time you come back to a level you already did you will have the concatenation in the data presented and not what is in the json file.
To solve this problem you need to work on a hard copy of the variable.
I find this approach interesting as we will be able to present randomized data to the user, as long as the datas to be taught in the level is appearing much more often than already known elements. Let say 50% of the time. We could say that the first data presented is the new one to be taught or find an other way. To be discussed with the others.

why is this diff here?

it creates new variable, which is a hard copy not a reference,as we discussed.

this line will concatenate levelData to itself thrice, so we will get each copy of dominoes three times.

this will restrict the number of dominoes in each level to 15.

in line 137,156,159,167,170,171,178 just replaced the level.words with new variable levelData as we have to do every operation using this concatenated variable.

The previous code is treating all letters like a alphabets, and sometimes enabling shift even for digits. i have just added isDigit variable in if condition to ensure not to enable shift because of digit. counter case here is if levelData=[3,3]. the previous code will enable shift for this array.

in previous code,function initRandomWord(currentLevel + 1) shuffles the items.word, here we have to take care to do every operation with levelData. i checked the defination of this function and generated the random list by shyuffling levelData.

we said yesterday that it does not work. If you have 1 data at the beginning you don't obtain 15 data. We said you need to create an array containing 15 data randomly taken from the available data.

See previous comment.

Good, did you make sure it does not breack gletters? It should not but please check.

Not sure we need this since you will create our own random list, but here we may have a problem keeping gletters working.

do i have to make data set of 15 for each level regardless of initial data size as current approach is only increasing it size three times? can i use a loop here which randomly pick a element from level.words 15 times and push it into levelData variable.

i test it by playing all falling * activities and even sure with code changes which i have done, is there any more formal way to check?

levelData is already shuffled, and we can't use initRandomWord function for smallumbers2 as it will shuffle level.words, so i can make changes like this? -

 if(items.ourActivity.activityName !== "smallnumbers2"){
       items.wordlist.initRandomWord(currentLevel + 1)
else
       items.wordlist.randomWordList = levelData

we need to have a dataset made from data given in levelswords. The data should be randomly chosen but still have abotu equally distributed.
Let say we have 1 3 5 in our data, it would be good to have 1 3 5 5 3 1 3 5 1.
We should be able to have a non hard coded value given though the qml to replace 15. We can call it count.
And we need to have a special dataname to descripbe the list of the data that are really targeted for a given level
Let say we introduce 4 and 5 we need to have 50% of the time 4 and 5 and 50% of the the rest of the data.

I need to investigate this one furthut is is not clear to me :(

At the present moment this discussion is not necessary anymore as our current problem will be soved once you will have created your input data array containing the data to give to the user.

algorithm

separately

remove useless spaces before/after parenthesis

for(var i = 0 ...)

probability

an element

indentation

I think it's not needed to have "level" (unused)

Here can you have a detailed comment to explain what maxSubLevel is used for. Something to say that it gives the number of falling elements presented for each level. ?

Yes, maxSubLevel stores the number of dominoes to fall down in each level, in previous code it is equals to level.words.length but this time i added attribute sublevels in json to pass it a value.
Reason for choosing this name is that activity previously also using this variable for storing number of falling elements as on line no. 128, 139,141,452.
and i choose the name sublevels for json after looking the defination of function
items.wordlist.getMaxSubLevel(currentLevel + 1) .

I mean a comment in the code, not for me :)
I understood this part, but it tool me time, a detailed comment will help maintenainers and other coder.

add { }

remove space before )

add { }

remove space before )

remove space before )

it would be better to have an attribute named useDataset in the Activity.qml that is set to true for smallnumbers and smallnumbers2.
This way, if we update another activity, we will only have to update this variable instead of changing all "if" conditions in the js.