JavaScript: Find all unique values in an array

JavaScript Array: Exercise-45 with Solution

Unique Values in Array

Write a JavaScript program to find all the unique values in a set of numbers.

• Create a new Set() from the given array to discard duplicated values.
• Use the spread operator (...) to convert it back to an array

Sample Solution:

JavaScript Code :

// Function to return an array with unique elements using the Set data structure
const unique_Elements = arr => [...new Set(arr)];

// Output the result of applying unique_Elements to an array with duplicate elements
console.log(unique_Elements([1, 2, 2, 3, 4, 4, 5]));

// Output the result of applying unique_Elements to an array without duplicate elements
console.log(unique_Elements([1, 2, 3, 4, 5]));

// Output the result of applying unique_Elements to an array with negative and duplicate elements
console.log(unique_Elements([1, -2, -2, 3, 4, -5, -6, -5]));

Output:

[1,2,3,4,5]
[1,2,3,4,5]
[1,-2,3,4,-5,-6]

Flowchart :

Live Demo :

See the Pen javascript-array-exercise-45 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that finds all unique values in an array by filtering out duplicates.
• Write a JavaScript function that uses a Set to return a new array of unique values from the input array.
• Write a JavaScript function that iterates through an array and collects unique elements manually.
• Write a JavaScript function that handles arrays with objects by converting them into comparable primitives and returning unique entries.

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