Copying A Multi Dimensional Array

[cothedo]

I have a multi-dimensional array variable that I need to copymyArray1[x][y] and myArray2[x][y]Now, I can't just do this: myArray1 = myArray2The new array will only create a reference to the original array (In other words, when I change a value in the new array, the original will also be changed). For a single dimensional array, you can use the "slice" method to copy an array, without it becoming a reference to the original. But how can you use "slice" for multi-dimensional arrays? I tried to google it, but couldn't find anything.

[jesh]

How about something along these lines:

for(var i = 0; i < myArray1.length; i++){	myArray2[i] = myArray1[i].slice(0);}

[jeffman]

Interestingly, Jesh's method seems to work no matter what gets stored in the array variables. I tried this where one of the second-order array variables held a two-dimensional object, and everything copied just fine. I had imagined some hideously recursive method, but it looks like you only have to go one level deep in order to grab everything.

[rnd me]

loops are slow, and you don't need one here. myArray2 = myArray1.concat();will do exactly what you want in a lot less time and code.i fell in love with the trick as soon as i saw it a while back...

[jeffman]

Sweet! <smacks self on forehead>

[rnd me]

background info for nerds:in fact, r2=r1.slice(); should do the same thing...the above slice example (post #2) worked because slice returns a new array, as does concat...