var someObj = { propName: "John" }; function propPrefix(str) { var s = "prop"; return s + str; } var someProp = propPrefix("Name"); // someProp now holds the value 'propName' console.log(someObj[someProp]); // "John"
var dogs = { Fido: "Mutt", Hunter: "Doberman", Snoopie: "Beagle" }; var myDog = "Hunter"; var myBreed = dogs[myDog]; console.log(myBreed); // "Doberman"