It can be done using Set.
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = array1.concat(array2);
var tempSet = new Set(array3);
array3 = Array.from(tempSet);
//output: ["Vijendra", "Singh", "Shakya"]
var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = array1.concat(array2);
var tempSet = new Set(array3);
array3 = Array.from(tempSet);
//show output
document.body.querySelector("div").innerHTML = JSON.stringify(array3);<div style="width:100%;height:4rem;line-height:4rem;background-color:steelblue;color:#DDD;text-align:center;font-family:Calibri" >
temp text
</div>
