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

Filter an Array of Objects with Another Array of Objects

Problem:

You want to filter an array of objects based on matches with a second array of objects. For instance, given the following arrays:

<code class="js">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" },
];
myFilter = [
  { userid: "101", projectid: "11" },
  { userid: "102", projectid: "12" },
  { userid: "103", projectid: "11" },
];</code>

You need to filter myArray to only include objects where the userid and projectid properties match those in myFilter. The expected result is:

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

Solution:

To filter the array, you can utilize the filter and some array methods:

<code class="js">const myArrayFiltered = myArray.filter((el) => {
  return myFilter.some((f) => {
    return f.userid === el.userid && f.projectid === el.projectid;
  });
});</code>

Explanation:

• The filter method iterates over myArray and creates a new array containing only the objects that satisfy the condition provided as an argument.
• The some method, used within the condition, checks if any element in myFilter matches the userid and projectid properties of the current element in myArray.
• If a match is found, the some method returns true, indicating that the current element should be included in the filtered array.

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