JavaScript: Get every element that exists in any of the two arrays once

JavaScript fundamental (ES6 Syntax): Exercise-110 with Solution

All Elements from Two Arrays

Write a JavaScript program to get every element in any of the two arrays at once.

Note: Create a Set with all values of a and b and convert to an array.

• Create a new Set() with all values of a and b and convert it to an array.

Sample Solution:

JavaScript Code:

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

// Define a function 'union' to return the union of two arrays.
const union = (a, b) =>
  // Use the spread operator (...) to concatenate the arrays 'a' and 'b'.
  // Use the 'Set' object to create a new set from the concatenated array, removing duplicates.
  // Convert the set back to an array using 'Array.from' to get the union of the two arrays.
  Array.from(new Set([...a, ...b]));

// Test the 'union' function with examples.
console.log(union([1, 2, 3], [4, 3, 2])); // Output: [1, 2, 3, 4]
console.log(union([1, 2, 3], [1, 2, 3])); // Output: [1, 2, 3]

Output:

[1,2,3,4]
[1,2,3]

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-110-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns a new array containing all elements that appear in either of two arrays (the union).
• Write a JavaScript function that merges two arrays and eliminates duplicate values.
• Write a JavaScript program that concatenates two arrays and then sorts the resulting array without mutating the originals.

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