// Set the value of myNum to 20.
var myNum = 20;
// Create a new variable, anotherNum, and copy the contents of myNum to it. 
// Both anotherNum and myNum are now 20.
var anotherNum = myNum;
// Change the value of myNum to 1000. 
// Note that the contents of anotherNum haven't changed.
myNum = 1000;
// Display the contents of both variables.
alert(myNum);
alert(anotherNum);