javascript - get dictionary values

How to Get Dictionary Values in JavaScript?

If you are working with JavaScript, you may come across a situation where you need to retrieve the values of a dictionary or an object. In JavaScript, dictionaries are commonly known as objects.

There are several ways to get the values of a dictionary in JavaScript, and I will explain them one by one.

Method 1: Using Object.values()

The easiest way to get the values of a dictionary is by using the built-in method Object.values(). This method returns an array of the values of the properties of an object.

const dictionary = {name: 'John', age: 25, gender: 'Male'};
const values = Object.values(dictionary);
console.log(values); // Output: ['John', 25, 'Male']

In this example, we have created a dictionary object with three properties: name, age, and gender. We have then used the Object.values() method to get an array of the values of these properties and stored it in the values variable.

Method 2: Using a for...in loop

You can also get the values of a dictionary using a for...in loop. This loop iterates over the properties of an object and retrieves their values.

const dictionary = {name: 'John', age: 25, gender: 'Male'};
const values = [];
for (let key in dictionary) {
  values.push(dictionary[key]);
}
console.log(values); // Output: ['John', 25, 'Male']

In this example, we have created a dictionary object with three properties: name, age, and gender. We have then used a for...in loop to iterate over the properties of the dictionary and push their values into the values array.

Method 3: Using Object.entries()

The Object.entries() method returns an array of arrays containing the key-value pairs of an object.

const dictionary = {name: 'John', age: 25, gender: 'Male'};
const entries = Object.entries(dictionary);
const values = entries.map(entry => entry[1]);
console.log(values); // Output: ['John', 25, 'Male']

In this example, we have used the Object.entries() method to get an array of arrays containing the key-value pairs of the dictionary. We have then used the map() method to only retrieve the values of the properties and stored them in the values array.

Conclusion

In conclusion, there are several ways to get the values of a dictionary or an object in JavaScript. You can use the built-in Object.values() method, a for...in loop, or the Object.entries() method along with the map() method. Choose the method that suits your needs and use it accordingly.