How to Filter an Array of Objects Based on Another Array of Objects?

Filter Array of Objects Based on Another Array of Objects

Problem:

Given two arrays of objects, the goal is to filter the first array based on a specific criterion using the second array as reference. Specifically, we want to filter the first array to include only those objects that match specific properties (userid and projectid) with objects in the second array.

Solution:

utilizing the filter and some methods in the array, we can achieve the following solution:

1. First Array Iteration:
   Use the filter method on the first array to iterate over each element.
2. Match Check:
   Inside the filter callback function, use the some method on the second array to check if there is an object that matches the current element of the first array based on the userid and projectid properties.
3. Filtering:
   If there is a match, the some function will return true, which will retain that element in the filtered result array.

Example:

<code class="js">const myArray = [{ userid: "100", projectid: "10", rowid: "0" },
                { userid: "101", projectid: "11", rowid: "1" },
                { userid: "102", projectid: "12", rowid: "2" },
                { userid: "103", projectid: "13", rowid: "3" },
                { userid: "101", projectid: "10", rowid: "4" }];

const myFilter = [{ userid: "101", projectid: "11" },
                { userid: "102", projectid: "12" },
                { userid: "103", projectid: "11" }];

const myArrayFiltered = myArray.filter((el) => {
  return myFilter.some((f) => {
    return f.userid === el.userid && f.projectid === el.projectid;
  });
});

console.log(myArrayFiltered);</code>

Expected result:

<code class="js">[
  { userid: "101", projectid: "11", rowid: "1" },
  { userid: "102", projectid: "12", rowid: "2" }
]</code>

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