Lesson 21
JavaScript
Modern JavaScript
Explore modern JavaScript features including const, let and arrow functions.
What you should understand
Read the lesson carefully, study the example, then use the editor below to experiment with the code yourself.
Example Code
JavaScript example
const add = (a, b) => a + b; console.log(add(5, 10));
Output
See what your code produces.
Click "Run Example" to execute the example.
Quick Check
Test your understanding
Choose the best answer.
Which method can select an element by its ID?