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How to find the sum of the vectors inside a custom array?

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Crystal Goh
How to find the sum of the vectors inside a custom array?
on Oct 25, 2019 at 6:55:45 am

Hi all, I am pretty new to expressions and trying to do an expression that finds the total width from my image layers ( which all have different widths, number of image layers not fixed).
My current issue is not knowing how to sum up the vectors inside the array I made. This stackflow thread has answered the question but when using their code, I still get errors:

Would really appreciate any help!

// Variables
var myArray = [];
var i = 0;
var curLayer = thisComp.layer(i);

// Execution
for (; i<=thisComp.numLayers ; i++){

myArray.slice(2); /*Theres 2 layers in my comp that are not image layers, hence slicing them off.*/
//Next line am VERY unclear on getting the total width number with reduce()
return myArray.reduce(???);

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