how to copy prototype of A object to B object js code example

Example 1: copy object javascript

// es6
const obj = {name: 'john', surname: 'smith'};
const objCopy = {...obj};

Example 2: clone an object javascript

//returns a copy of the object
function clone(obj) {
    if (null == obj || "object" != typeof obj) return obj;
    var copy = obj.constructor();
    for (var attr in obj) {
        if (obj.hasOwnProperty(attr)) copy[attr] = obj[attr];
    }
    return copy;
}