Javascript default object method -

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is there way how create default method call when method called object undefined?

e.g.

myobj = {    default: function(){        console.log("you've called method isn't defined");    },    sayhi: function(){        console.log("myobj says hi!");    } }  //console output: "myobj says hi!" myobj.sayhi();  //console output: "you've called method isn't defined" myobj.methodthatisnotreallythere();