JSFiddle - React, Tailwind, and code Playground

by Elak

JavaScript

var options = {myOpt1:1, myOpt2:2};
var userOptions = {myOpt1:3};

for(var p in options){
    if(userOptions.hasOwnProperty(p)){
        options[p] = userOptions[p];
    }
}

console.log(options);