Question

How to merge two sorted arrays without duplicates in JavaScript

Answer 1

const merge = (arr1, arr2) => {
    const mergedSet = new Set([...arr1, ...arr2]);
     
    return Array.from(mergedSet);
};
 
const arr1 = [1, 2, 2, 3, 7, 7, 7, 8, 9];
const arr2 = [0, 0, 4, 4, 4, 5, 6, 7, 7, 8];
 
const mergedArray = merge(arr1, arr2);

mergedArray.sort();
 
console.log(mergedArray);

 
            
  
/*
run:
    
[
  0, 1, 2, 3, 4,
  5, 6, 7, 8, 9
]
      
*/

 

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Answer 2

let array1 = ['javascript', 'php', 'c'];
let array2 = ['php', 'javascript', 'c#', 'c++', 'c'];
 
let arr = [...new Set([...array1,...array2])]
 
console.log(arr);    
   
     
     
/*
run:
     
["javascript", "php", "c", "c#", "c++"]
     
*/

 

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Answer 3

let array1 = ['javascript', 'php', 'c'];
let array2 = ['php', 'javascript', 'c#', 'c++', 'c'];
 
let arr = array1.concat(array2); 
 
arr = arr.filter(function (item, index) {
  return arr.indexOf(item) === index;
});
 
console.log(arr);   
   
     
     
/*
run:
     
["javascript", "php", "c", "c#", "c++"]
     
*/

 

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