Discover discrepancies (including additional elements) within n sets of objects

In my current project, I am working with an array named props which consists of multiple arrays containing objects. Each object within these arrays has four properties: participation_enabled, name, pathing_enabled, and id. These properties can have varying values across different arrays.

My main objectives are twofold:
1) Identify all the object properties that differ among the arrays and store them in a separate array called diffs;
2) Find any extra objects (unique id) that do not exist in other arrays and store them in an array named extra.

While my code successfully captures the differences, it currently falls short in identifying all the extra objects...

For instance, consider the following example:

[
  [
    {participation_enabled:"false", name:"PropEins", pathing_enabled:"true", id:"prop1"}, 
    {participation_enabled:"false", name:"User Status", pathing_enabled:"false", id:"prop2"}, 
    {participation_enabled:"false", name:"Initial ID", pathing_enabled:"false", id:"prop3"}, 
    {participation_enabled:"false", name:"User ID", pathing_enabled:"false", id:"prop4"}, 
    {participation_enabled:"false", name:"Subdomain3", pathing_enabled:"false", id:"prop20"},
    {participation_enabled:"false", name:"Subdomain4", pathing_enabled:"false", id:"prop21"},
    {participation_enabled:"false", name:"Subdomain5", pathing_enabled:"false", id:"prop22"}
  ], 
  ...
]

The resulting diffs array from this example should include:

[
  ...
]

Additionally, the extra array should capture:

[
  ...
]

This excerpt features my original implementation code:

  
...
javascriptarraysgoogle-apps-script

Answer №1

I have successfully implemented and tested the following solution:

var data = [
  [
    {enabled:"false", title:"PropOne", tracking_enabled:"true", id:"prop1"}, 
    {enabled:"false", title:"User Status", tracking_enabled:"false", id:"prop2"}, 
    {enabled:"false", title:"Initial ID", tracking_enabled:"false", id:"prop3"}, 
    {enabled:"false", title:"User ID", tracking_enabled:"false", id:"prop4"}, 
    {enabled:"false", title:"Subdomain3", tracking_enabled:"false", id:"prop20"},
    {enabled:"false", title:"Subdomain4", tracking_enabled:"false", id:"prop21"},
    {enabled:"false", title:"Subdomain5", tracking_enabled:"false", id:"prop22"}
  ], 
  [
    {enabled:"false", title:"PropOne", tracking_enabled:"false", id:"prop1"}, 
    {enabled:"false", title:"Room", tracking_enabled:"false", id:"prop2"}, 
    {enabled:"false", title:"Domain", tracking_enabled:"false", id:"prop70"}
  ], 
  [
    {enabled:"true", title:"PropOne", tracking_enabled:"true", id:"prop1"}, 
    {enabled:"true", title:"User Status", tracking_enabled:"true", id:"prop2"}, 
    {enabled:"true", title:"Tracking Code", tracking_enabled:"true", id:"prop3"}, 
    {enabled:"false", title:"User ID", tracking_enabled:"true", id:"prop4"}, 
    {enabled:"false", title:"User ID2", tracking_enabled:"false", id:"prop50"}
  ]
];
  var diffData = {};
  var extraItems = [];
  var itemIds = [];
  var uniqueKeys = [];
  
  data.forEach(function(item){
    item.forEach(function(element) {
      itemIds.push(element.id);
    });
  })
  itemIds.filter(function(a){
    if(itemIds.indexOf(a) == itemIds.lastIndexOf(a)) {
      uniqueKeys.push(a);
    }
  });
  data.forEach(function(item){
    item.forEach(function(element){
      if(uniqueKeys.indexOf(element.id) >= 0) {
        
        extraItems.push(element);
      }    
    });
  });
  
  data.forEach(function(item, i){
    if (i == 0) {
      item.forEach(function(element, ind){
        diffData[element.id] = {};
        diffData[element.id].index = [ind];
        for (var key in element) {
          diffData[element.id][key] = [element[key]];
        }
      });
    }
    else {
      item.forEach(function(element){
        var itemId = element.id;
        for (var key in element) {
          if(diffData[itemId]) {
            diffData[itemId][key].push(element[key]);
          }
        }
      });
    }
  });
  
  for (var key in diffData) {
    var nestedItem = diffData[key];
    var indexValue = nestedItem.index.pop();
    for (nestedKey in nestedItem) {
      nestedItem[nestedKey] =  _.filter(nestedItem[nestedKey], function(item, pos) {
        return nestedItem[nestedKey].indexOf(item) == pos;
      });
      
      if (nestedItem[nestedKey].length < 2) {delete nestedItem[nestedKey];}
      
    }
    diffData[key].id = key;
    diffData[key].index = indexValue
    if (_.keys(diffData[key]).length < 3) {delete diffData[key];}
  }
  
  diffData = _.values(diffData);
  console.log("extra items:", extraItems);
  console.log("different values:", diffData);
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

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