Functions Are Objects - JsPlayground 2022

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JavaScript - Functions Are Objects

arguments.length
Since functions have both properties and methods, they are considered objects. The arguments.length property returns the number of arguments received when the function was invoked.


function myFunction(a, b)
{
    return arguments.length;
}
document.getElementById("demo1").innerHTML = myFunction("foo", "bar");

toString()
The toString() method returns the definition of the function. Note that we do not pass the actual arguments.


function myFunction(a, b)
{
    return arguments.length;
}
document.getElementById("demo1").innerHTML = myFunction.toString();