Search⌘ K
AI Features
Home
Courses
JavaScript Brain Teasers: Exercise Your Mind

Discussion: The Usurper

Explore how JavaScript manages functions with the same name by learning to simulate function overloading through argument type and count checks. Understand practical examples like calculating areas for squares and rectangles, and see how ES6 features like default parameters improve flexibility.

We'll cover the following...

Verifying the output

Now, it’s time to execute the code and observe the output.

Javascript (babel-node)
// Calculate the area of a rectangle
function calculateArea(length, width) {
  return length * width;
}
// Calculate the area of a square
function calculateArea(length) {
  return length * length;
}
console.log(calculateArea(4, 6));

Understanding the output

You might have expected the first function, which accepts two arguments, to be executed. Instead, the second function is executed, resulting in the following output:

16

Functions with the same name

JavaScript doesn’t ...