w3resource

JavaScript: Get a list of elements that exist in both arrays, using a provided comparator function

JavaScript fundamental (ES6 Syntax): Exercise-209 with Solution

Common Elements by Comparator

Write a JavaScript program to get a list of elements in both arrays, using a provided comparator function.

  • Use Array.prototype.filter() and Array.prototype.findIndex() in combination with the provided comparator to determine intersecting values.

Sample Solution:

JavaScript Code:

// Define a function 'intersectionWith' that computes the intersection of two arrays based on a custom comparator function
const intersectionWith = (a, b, comp) => 
  a.filter(x => 
    // Filter elements from array 'a' that have a matching element in array 'b' based on the custom comparator function 'comp'
    b.findIndex(y => comp(x, y)) !== -1
  );

// Test the 'intersectionWith' function by finding the intersection of two arrays with a custom comparator function
console.log(intersectionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)));
// Output: [1.5, 3, 0]

Output:

[1.5,3,0]

Flowchart:

flowchart: Get a list of elements that exist in both arrays, using a provided comparator function

Live Demo:


For more Practice: Solve these Related Problems:

  • Write a JavaScript program that returns a list of common elements between two arrays using a custom comparator function.
  • Write a JavaScript function that compares each element of one array to every element of another using a comparator and collects matches.
  • Write a JavaScript program that uses a nested loop and a comparator to identify shared elements between arrays.
  • Write a JavaScript function that leverages filter and some methods with a custom comparator to find intersections.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to check if the provided value is of the specified type.
Next: Write a JavaScript program to get a list of elements that exist in both arrays, after applying the provided function to each array element of both.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.