Filtering array of objects in JavaScript

Suppose, we have two arrays of literals and objects respectively −

const source = [1, 2, 3 , 4 , 5];
const cities = [{ city: 4 }, { city: 6 }, { city: 8 }];

We are required to write a JavaScript function that takes in these two arrays. Our function should create a new array that contains all those elements from the array of objects whose value for "city" key is present in the array of literals.

Example

Let us write the code −

const source = [1, 2, 3 , 4 , 5];
const cities = [{ city: 4 }, { city: 6 }, { city: 8 }];
const filterByLiterals = (objArr, literalArr) => {
   const common = objArr.filter(el => {
      return literalArr.includes(el['city']);
   });
   return common;
};
console.log(filterByLiterals(cities, source));

Output

And the output in the console will be −

[ { city: 4 } ]