NO OVERLOADING

ECMAScript functions cannot be overloaded in the traditional sense. In other languages, such as Java, it is possible to write two definitions of a function as long as their signatures (the type and number of arguments accepted) are different. As just discussed, functions in ECMAScript don't have signatures because the arguments are represented as an array containing zero or more values. Without function signatures, true overloading is not possible.

If two functions are defined to have the same name in ECMAScript, it is the last function that becomes the owner of that name. Consider the following example:

function addSomeNumber(num) {
 return num + 100;
}
          
function addSomeNumber(num) {
 return num + 200;
}
          
let result = addSomeNumber(100); // 300

Here, the function addSomeNumber() is defined twice. The first version of the function adds 100 to the argument, and the second adds 200. When the last line is called, it returns 300 because the second...