JS merge two one-dimensional arrays and remove the same items (collation)

// Declare two arrays 
let arr1 = [1,2,3,4,5,'b'];
let arr2 = ['a',1,'b',5,4];
 
// First combine the two arrays into an array 
// Use concat
let cArr = arr2.concat(arr1);
 
// Use for loop 
for(let i = 0; i < arr1.length; i++){
    
   arr2.push(arr1[i]);
}
 
// And then through the merged array call Array.from(new Set( Parameters are arrays ));
let arr = Array.from(new Set(arr2));
console.log(arr);