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    <p>To just merge the arrays (without removing duplicates)</p> <h3>ES5 version use <code>Array.concat</code>:</h3> <pre><code>var array1 = ["Vijendra","Singh"]; var array2 = ["Singh", "Shakya"]; var array3 = array1.concat(array2); // Merges both arrays // [ 'Vijendra', 'Singh', 'Singh', 'Shakya' ] </code></pre> <h3>ES6 version use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment" rel="noreferrer">destructuring</a></h3> <pre><code>const array1 = ["Vijendra","Singh"]; const array2 = ["Singh", "Shakya"]; const array3 = [...array1, ...array2]; </code></pre> <p>Since there is no 'built in' way to remove duplicates (<a href="http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf" rel="noreferrer">ECMA-262</a> actually has <code>Array.forEach</code> which would be great for this), we have to do it manually:</p> <pre><code>Array.prototype.unique = function() { var a = this.concat(); for(var i=0; i&lt;a.length; ++i) { for(var j=i+1; j&lt;a.length; ++j) { if(a[i] === a[j]) a.splice(j--, 1); } } return a; }; </code></pre> <p>Then, to use it:</p> <pre><code>var array1 = ["Vijendra","Singh"]; var array2 = ["Singh", "Shakya"]; // Merges both arrays and gets unique items var array3 = array1.concat(array2).unique(); </code></pre> <p>This will also preserve the order of the arrays (i.e, no sorting needed).</p> <p>Since many people are annoyed about prototype augmentation of <code>Array.prototype</code> and <code>for in</code> loops, here is a less invasive way to use it:</p> <pre><code>function arrayUnique(array) { var a = array.concat(); for(var i=0; i&lt;a.length; ++i) { for(var j=i+1; j&lt;a.length; ++j) { if(a[i] === a[j]) a.splice(j--, 1); } } return a; } var array1 = ["Vijendra","Singh"]; var array2 = ["Singh", "Shakya"]; // Merges both arrays and gets unique items var array3 = arrayUnique(array1.concat(array2)); </code></pre> <p>For those who are fortunate enough to work with browsers where ES5 is available, you can use <code>Object.defineProperty</code> like this:</p> <pre><code>Object.defineProperty(Array.prototype, 'unique', { enumerable: false, configurable: false, writable: false, value: function() { var a = this.concat(); for(var i=0; i&lt;a.length; ++i) { for(var j=i+1; j&lt;a.length; ++j) { if(a[i] === a[j]) a.splice(j--, 1); } } return a; } }); </code></pre>
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    1. POHow to merge two arrays in JavaScript and de-duplicate items
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    1. POHow to merge two arrays in JavaScript and de-duplicate items
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    1. CONote that this algorithm is O(n^2).
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    2. COLet `[a, b, c]` and `[x, b, d]` be the arrays (assume quotes). concat gives `[a, b, c, x, b, d]`. Wouldn't the unique()'s output be `[a, c, x, b, d]`. That doesn't preserve the order I think - I believe OP wants `[a, b, c, x, d]`
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    3. COOP accepted the first answer that got him working and signed off it seems. We are still comparing each others' solutions, finding-n-fixing faults, improving performance, making sure its compatible everywhere and so on... The beauty of stackoverflow :-)
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