JavaScript: Get the difference between two given arrays

JavaScript fundamental (ES6 Syntax): Exercise-244 with Solution

Write a JavaScript program to get the difference between two given arrays.

• Create a Set from b to get the unique values in b.
• Use Array.prototype.filter() on a to only keep values not contained in b, using Set.prototype.has().

Sample Solution:

JavaScript Code:

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

Sample Output:

[3]
[4]

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-244-1 by w3resource (@w3resource) on CodePen.

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