Is there a better way to do optional function parameters in JavaScript? [duplicate]

Answer 1

Landed to this question, searching for default parameters in EcmaScript 2015, thus just mentioning...

With ES6 we can do default parameters:

function doSomething(optionalParam = "defaultValue"){
    console.log(optionalParam);//not required to check for falsy values
}

doSomething(); //"defaultValue"
doSomething("myvalue"); //"myvalue"