Create a polyfill for Object.entries method

In modern JavaScript development, Object.entries() is a handy method introduced in ECMAScript 2017 for iterating over the properties of an object! However, support for this method may be lacking in older browsers. That’s where polyfills come into play. In this blog post, we’ll explore how to create a polyfill for Object.entries() to ensure compatibility across different browser environments.

Understanding Object.entries(): Object.entries() is a method that returns an array of a given object’s own enumerable string-keyed property [key, value] pairs, in the same order as that provided by a for…in loop.

Here’s an example:

const obj ={
    a: "Rowdy",
    b: "Coder",
    c: "Subscribe",
    channel: {
        f: "Subscribed"
    }
}

console.log(Object.entries(obj)); // [[ 'a', 'Rowdy' ],[ 'b', 'Coder' ],[ 'c', 'Subscribe' ],[ 'channel', { f: 'Subscribed' } ]]

Why Create a Polyfill?: Polyfills are essential in web development because they allow developers to use modern JavaScript features while ensuring compatibility with older browsers. By creating a polyfill for Object.entries(), we can leverage this powerful method without worrying about browser support limitations.

Implementation:

Object.prototype.myEntries = function (myObj){
    const keys = Object.keys(myObj);
    const values = Object.values(myObj);
    const result =[];
    for(let i=0;i<keys.length;i++){
        result.push([keys[i], values[i]]);
    }
    return result;
}

console.log(Object.myEntries(obj));

Another simple way to implement:

Object.myEntries = function(obj) {
  return Object.keys(obj).map(key => [key, obj[key]]);
};