How To Create 2D Arrays

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So Right now, Im trying to create 2D Arrays with JavaScript. What I mean by 2D Arrays is like the following image before (I'm Pretty Sure It's A 2D Array) So how would you go around creating this in Javascript?

this should be what you're looking for... somewhat of a vague question but im sure it will get you started at least.

var Element = new Array(numberOfElements);

for(x=0; x < numberOfElements; x++){
    Element[x] = new Array(numberOfCols);

//then you can access the elements by...
Element[elementIndex, colIndex];

this actually looks like a 3d array to me. At the top left of the image it says rows, elements, then cols. regardless it would be the same concept.