Cannot call method 'split' of undefined - Called From Function

Question

I have a JS function that is called on load that spilts some variables, this all works well, but when I call the function from another function, I get this error Cannot call method 'split' of undefined:

function loadInAttachmentsIntoSquads(){
    // eg: 5000,5000,5000,5000 > [5000][5000][5000]
    myAttachmentArray = currentAttachments.split(',');

    //eg: [5000][5000][5000] > [5][0][0][0]
    //myAttachmentForWeapon = myAttachmentArray[mySquadsIndex].split('');

    setupWeaponAttachments();
}


function setupWeaponAttachments(){

    myAttachmentForWeapon = myAttachmentArray[mySquadsIndex].split('');

    //if(mySquadsIndex == 0){
        if(myAttachmentForWeapon[1] == 1){ // if silencer is on? //first digit is always 5
            weaponAttachments.silencer = true;
        }
        else{
            weaponAttachments.silencer = false;
        }
        if(myAttachmentForWeapon[2] == 1){ // if silencer is on? //first digit is always 5
            weaponAttachments.grip = true;
        }
        else{
            weaponAttachments.grip = false;
        }
        if(myAttachmentForWeapon[3] == 1){ // if silencer is on? //first digit is always 5
            weaponAttachments.redDot = true;
        }
        else{
            weaponAttachments.redDot = false;
        }

    // -- applies visuals -- \\
    applyWeaponAttachments();
}

If I call setupWeaponAttachments() from another function, I get that error ... why?

Solution

In the following:

> function loadInAttachmentsIntoSquads(){
>     
>     myAttachmentArray = currentAttachments.split(',');
> 
>     setupWeaponAttachments(); 
> }

The identifier currentAttachments is used as if it's a global variable. If it hasn't been assigned value, or its value isn't a string, at the time that the function is called, then an error will result.

So the fix is to make sure it has a string value:

function loadInAttachmentsIntoSquads(){
    if (typeof currentAttachments != 'string') return;
    ...
}

or deal with the error some other way.

Also, where you are doing all those if..else blocks, consider:

weaponAttachments.silencer = myAttachmentForWeapon[1] == 1;
weaponAttachments.grip     = myAttachmentForWeapon[2] == 1;
weaponAttachments.redDot   = myAttachmentForWeapon[3] == 1;

It won't be any faster, but it is a lot less code to write and read.