what is the difference between .function() and a function(args) in javascript

Question

I have a question i have always written functions in javascript for returning or setting values of other elements like so:

function test(x, y){
   return x*y;
}

and call the function like so:

test(20, 50);

but in libraries like jquery you also see functions like so:

var test = something.test();

so my question is what is the difference between the following functions .test() or test() or are they the same and how is this other way of writing a function called?

and how do you write a .function()

Hope to learn something new, sorry if this is a bit random but i am just very curious.

Answer 1

This is a function. It is called as function()

function test(a, b) {
  return a * b;
}

console.log(test(2,3));

This is a method of an object. It is a function that is declared in the object and is called as object.function()

var myObject = {
  test: function (a, b) {
    return a * b;
  }
}

console.log(myObject.test(2,3));