var anObject = {left: 1, right: 2};
console.log("\nanObject.left:\t\t", anObject.left);

delete anObject.left;
console.log("anObject.left:\t\t", anObject.left);

console.log("left in anObject:\t", "left" in anObject);
console.log("right in anObject:\t", "right" in anObject);

