You can do it simply with ES6,

var array1 = ["Vijendra","Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = [...new Set([...array1 ,...array2])];
console.log(array3); //["Vijendra","Singh","Shakya"];

• Use spread operator for concatenating the array.
• Use Set for creating a distinct set of elements.
• Again use spread operator to convert the Set into an array.

You can do it simply with ECMAScript 6,

var array1 = ["Vijendra", "Singh"];
var array2 = ["Singh", "Shakya"];
var array3 = [...new Set([...array1 ,...array2])];
console.log(array3); // ["Vijendra", "Singh", "Shakya"];

• Use the spread operator for concatenating the array.
• Use Set for creating a distinct set of elements.
• Again use the spread operator to convert the Set into an array.