In programming, function overloading refers to the concept where multiple functions with the same names can have different implementations. However, in JavaScript, if there are multiple functions with the same name, the function that is defined at the last gets executed.
The function overloading feature can be implemented in some other ways.
Example 1: Using if/else-if Statement
// program to perform function overloading
function sum() {
// if no argument
if (arguments.length == 0) {
console.log('You have not passed any argument');
}
// if only one argument
else if (arguments.length == 1) {
console.log('Pass at least two arguments');
}
// multiple arguments
else {
let result = 0;
let length = arguments.length;
for (i = 0; i < length; i++) {
result = result + arguments[i];
}
console.log(result);
}
}
sum();
sum(5);
sum(5, 9);
sum(1, 2, 3, 4, 5, 6, 7, 8, 9);
Output
You have not passed any argument Pass at least two arguments 14 45
In the above program, the overloading feature is accomplished by using the if/else...if statement.
- In JavaScript, the
argumentsobject is automatically available inside a function that represents the passed arguments to a function. - The multiple conditions are addressed to perform actions based on that particular condition.
Example 2: Using switch Statement
// program to perform function overloading
function sum() {
switch (arguments.length) {
case 0:
console.log('You have not passed any argument');
break;
case 1:
console.log('Pass at least two arguments');
break;
default:
let result = 0;
let length = arguments.length;
for (i = 0; i < length; i++) {
result = result + arguments[i];
}
console.log(result);
break;
}
}
sum();
sum(5);
sum(5, 9);
sum(1, 2, 3, 4, 5, 6, 7, 8, 9);
Output
You have not passed any argument Pass at least two arguments 14 45
In the above program, the switch statement is used to accomplish the function overloading functionality. Different conditions result in different actions to be performed.
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