JavaScript: Get the symmetric difference between two given arrays, using a provided function as a comparator

JavaScript fundamental (ES6 Syntax): Exercise-132 with Solution

Symmetric Difference with Comparator

Write a JavaScript program to get the symmetric difference between two given arrays, using a provided function as a comparator.

• Use Array.prototype.filter() and Array.prototype.findIndex() to find the appropriate values.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2

// Define the 'symmetricDifferenceWith' function.
const symmetricDifferenceWith = (arr, val, comp) => [
  ...arr.filter(a => val.findIndex(b => comp(a, b)) === -1),
  ...val.filter(a => arr.findIndex(b => comp(a, b)) === -1)
];

// Test the 'symmetricDifferenceWith' function.
console.log(symmetricDifferenceWith(
  [1, 1.2, 1.5, 3, 0],
  [1.9, 3, 0, 3.9],
  (a, b) => Math.round(a) === Math.round(b)
));  

Output:

[1,1.2,3.9]

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-132-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that computes the symmetric difference between two arrays using a custom comparator function.
• Write a JavaScript function that returns elements that are unique to each array based on a provided equality test.
• Write a JavaScript program that iterates over two arrays and collects items that do not match between them, using a comparator.

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