How to multiply objects by specified rules?

Question

Let's say i want an object that when multiplied with, it multiplies by two and subtracts 1. The syntax would look like this:

var a = {
    on_multiply: function(context){
        return context*2-1
    }
};
alert(2*a);

This would output 3. I don't want to write "a.on_multiply(2)" Is there a way to do this? If yes, is it possible to do this with arrays or matrixes also?

score 1 · Accepted Answer · answered Dec 18 '18 at 10:48

1

The simplest way I can think of to make the above example work is to assign a function named a, and have the context as a parameter of that function:

function a(context) {
    return (context * 2) - 1;
}

And if you really wanted a to be a function assigned to a name:

const a = context => 2 * context - 1;

And the above in ES5 syntax:

const a = functipn(context) {
    return (context * 2) - 1;
}

Hopefully this helps!

answered Dec 18 '18 at 10:48

Jack Bashford

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I will try that! – Samuel Garbergs 6 Dec 18 '18 at 10:57
That worked but is there a way to only write "2*a" rather than "a(2)"? – Samuel Garbergs 6 Dec 18 '18 at 11:03
No, because you want 2 to be the context of the function, correct? This is the only way to pass data to a function if you want to use a variable value. – Jack Bashford Dec 18 '18 at 11:13
I want 2 to be in the context of the multiplication with a. – Samuel Garbergs 6 Dec 18 '18 at 11:19
So, no then. You ***must*** pass 2 as a parameter to a, otherwise there is literally no way for a to receive 2. – Jack Bashford Dec 18 '18 at 11:22
Ok then, i will see what i can do! – Samuel Garbergs 6 Dec 18 '18 at 11:23

How to multiply objects by specified rules?

1 Answers1