Method #1: Using the Array.from() method

One way to get the last key in a Map object is by using the Array.from() method, which converts an iterable object into an array. Here’s an example:

const myMap = new Map();
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');
myMap.set('key3', 'value3');

const lastKey = Array.from(myMap.keys()).pop();

console.log(lastKey); // Output: key3

In this example, we first create a Map object called myMap and add some key-value pairs to it. Then, we use Array.from() to convert the keys of the map into an array. Finally, we apply the pop() method on the array, which removes and returns the last element, giving us the last key.

Method #2: Looping through the Map object

Another way to get the last key in a Map object is by using a loop to iterate over the keys and keep track of the last key encountered. Here’s an example:

const myMap = new Map();
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');
myMap.set('key3', 'value3');

let lastKey;
for (const key of myMap.keys()) {
  lastKey = key;
}

console.log(lastKey); // Output: key3

In this example, we define a variable lastKey outside the loop and update it with each iteration of the loop. At the end, lastKey will hold the last key encountered in the loop, which is the desired result.

Both methods provide a way to retrieve the last key in a Map object in JavaScript. Depending on your specific use case, choose the method that best suits your needs.

#JavaScript #Map