Sorted Union

SortedUnion.markdown

Sorted Union

Takes two or more arrays and returns a new array of unique values in the order of the original provided arrays. In other words, all values present from all arrays should be included in their original order, but with no duplicates in the final array. The unique numbers are sorted by their original order, but the final array is not sorted in numerical order.

A script by V.

License.

unite.js

function unite(arr1, arr2, arr3, arr4) {
  var baseName = "arr";
  var nArr = [];
  for (var i=0;i<arr1.length;i++){
    for (var j=0;j<arr2.length;j++){
      if (arr1[i] == arr2[j]){
        arr2.splice(j,1);
      }
    }
    if (arr3 !== undefined){
      for (var k=0;k<arr3.length;k++){
        if (arr1[i] == arr3[k]){
          arr3.splice(k,1);
        }
      }
    }
    if (arr4 !== undefined){
      for (var l=0;l<arr4.length;l++){
        if (arr1[i] == arr4[l]){
          arr4.splice(l,1);
        }
      }
    }
  }
  var q = 0;
  arr1.reduce(function(previousValue, currentValue, currentIndex, array) {
    nArr.push(currentValue);  
  },0);
  arr2.reduce(function(previousValue, currentValue, currentIndex, array) {
    nArr.push(currentValue);  
  },0);
  if (arr3 !== undefined){
    arr3.reduce(function(previousValue, currentValue, currentIndex, array) {
      nArr.push(currentValue);  
    },0);
  }
  if (arr4 !== undefined){
    arr4.reduce(function(previousValue, currentValue, currentIndex, array) {
      nArr.push(currentValue);  
    },0);
  }
  return nArr;
}

unite([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8]) ;