How Can I Effectively Simulate Function Overloading in JavaScript?

Function Overloading in JavaScript: Best Practices

If you're seeking ways to simulate function overloading in JavaScript, consider these options:

1. Distinct Function Names

Avoid using the same function name with varying parameters. Instead, opt for separate functions with different names.

2. Optional Arguments

Utilize optional arguments with default values. For instance, foo(x) can have y as an optional argument with a default value of undefined: foo(x, y = 'default').

3. Argument Length

Determine the number of arguments passed to the function. However, this approach can be unreliable as it doesn't consider the value of the arguments.

4. Argument Type Checking

Inspect the type of arguments passed to the function. While not recommended due to potential performance implications, this method ensures strict type adherence.

5. Object-Based Approach

Pass an object as the final argument to the function. This object can encapsulate additional parameters, allowing you to customize the function's behavior based on the object's properties.

Example:

function foo(a, b, opts) {
  // ...
  if (opts['test']) { // check if 'test' property exists in the object
    // perform specific actions
  }
}

foo(1, 2, { "method": "add" });
foo(3, 4, { "test": "equals", "bar": "tree" });

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