[removed] how to remove duplicate arrays inside array of arrays

Question

Input:

[[-1,-1,2],[-1,0,1],[-1,-1,2],[-1,0,1],[-1,-1,2],[-1,0,1],[-1,0,1]]

The output I want:

[[-1,-1,2],[-1,0,1]]
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Answer 1

You can create a hashMap and save values in it. This will always hold last value.

var data = [[-1,-1,2],[-1,0,1],[-1,-1,2],[-1,0,1],[-1,-1,2],[-1,0,1],[-1,0,1]]

var hashMap = {}

data.forEach(function(arr){
  // If your subArrays can be in any order, you can use .sort to have consistant order
  hashMap[arr.join("|")] = arr;
});

var result = Object.keys(hashMap).map(function(k){
  return hashMap[k]
})

console.log(result)