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QuestionHow to create array from existing array Pin
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QuestionJS Object Remove Duplicates Pin
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AnswerRe: JS Object Remove Duplicates Pin
W Balboos, GHB9-Aug-16 5:06
W Balboos, GHB9-Aug-16 5:06 
Here's some logic which, although not the most elegant will work across many programming languages. It is to teach you to solve a problem by breaking it down to smaller levels. Note that there are languages the let you automatically compare two arrays with a single function and this becomes much easier.

First, sort your array: any simply sort will do because if any entry is a mismatch then the array's your comparing are different. Sort by element 0, 1, 2, would be simplest to work with.

Second, for a 2-dimensional array, you can use nested loops.
Use a for() loop to operate on array elements explicitly by index so you can compare n and n+1
Similarly, work on the internal elements of of array n vs n+1, comparing them.
If you reach a failure to match, do a continue to the outer loop.
If you reach the end, they're a matched pair. Store the index of one of them.
Return to the outer loop for next (n+1, n+2).

When done, you can remove the duplicate members from the stored index list.

Various languages will allow you to do shortcuts.


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