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Notepad++ (due to its support of boost syntax) supports conditional statements in replacement string so we have no problem in converting those letters into their lowercase form as well as replacing underscores with a space character simultaneously.

You could indeed use a Map with as key a custom class that uses as component value these 3 data : x, y and z.

With a fair implementation of the hashCode() method, it should be a constant time [O(1)] or very close to.

If you have to recreate the map as often as you need to request it, using a map could be helpless as from one side you could loose what you gain from another side.

So, create this custom class and override hashCode() and equals() by taking these 3 fields into consideration :

When you write newArr.push(arr2); You're adding arr2 as a new element to newArr.

I guess you wanted to concatenate arrays. To do this you can use newArr.push.apply(newArr, arr2);