lodash merge array without duplicates code example

Example 1: js merge 2 lists

var array1 = ["Vijendra", "Singh"];
var array2 = ["Singh", "Shakya"];

console.log(array1.concat(array2));
// output: ["Vijendra", "Singh", "Singh", "Shakya"]

Example 2: lodash merge array of objects without duplicates

var c = _.map(a, function(obj) {
    return _.assign(obj, _.find(b, {parentId: obj.aId}));
})