'JavaScript Super.prop in object literals

let proto = {
    whoami() { console.log('I am proto'); } 
};
let obj = { 
    whoami() { 
        Object.getPrototypeOf( obj ).whoami.call( this ); // super.whoami();
        console.log('I am obj'); 
    } 
};
Object.setPrototypeOf( obj, proto );

This code lets obj inherit the proto. I got confused about this code Object.getPrototypeOf( obj ).whoami.call( this ); which is equvalent to super.whoami(). Can anyone explain how this code works?

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'JavaScript Super.prop in object literals

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