JavaScript - Unique Values (remove duplicates) in an Array

// Given array
let a = [ 10, 20, 20, 30, 40, 50, 50 ];

// Create set of unique values 
// using Set constructor
let s = new Set(a);

// Convert back the set to array
let a1 = [...s]

// Display the updated array
console.log("Updated Array: ", a1); 

// Given array
let a = [10, 20, 20, 20, 30, 30, 40, 50];

// Initialize epmty array to store unique values
let a1 = [];

// Iterate over the array to get unique values
for (let i = 0; i < a.length; i++) {
	
    // Check if the element exist in the new array
    if (!a1.includes(a[i])) {
    
    	// If not then push the element to new array
        a1.push(a[i]);
    }
}

// Display updated array
console.log("Updated Array: ", a1);

// Given array
let a = [10, 20, 20, 20, 30, 30, 40, 50];

// Use filter and return array with unique values 
let a1 = a.filter((e, i, self) => i === self.indexOf(e));

// Display the updated array
console.log("Updated Array: ", a1);