JavaScript: Get a list of elements that exist in both arrays

JavaScript fundamental (ES6 Syntax): Exercise-211 with Solution

Write a JavaScript program to get a list of elements that exist in both arrays.

• Create a Set from b, then use Array.prototype.filter() on a to only keep values contained in b.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const intersection = (a, b) => {
  const s = new Set(b);
  return a.filter(x => s.has(x));
};
console.log(intersection([1, 2, 3], [4, 3, 2]));

Sample Output:

[2,3]

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-211-1 by w3resource (@w3resource) on CodePen.

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