website generation

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website generation website generation For example, we may want to allow the individual Account objects to compare their raw balances, but may want to hide those balances from the rest of the world (perhaps because we present them in a different form). class Account attr_reader :balance # accessor method 'balance' protected :balance # and make it protected def greaterBalanceThan(other) return @balance > other.balance end end Because the attribute balance is protected, it's available only within Account objects.Variables Now that we've gone to the trouble to create all these objects, let's make sure we don't lose them. Variables are used to keep track of objects; each variable holds a reference to an object.

website generation Figure not available... Let's confirm this with some code. person = "Tim" person.

website generation id » 537771100 person.type » String person » "Tim" On the first line, Ruby creates a new String object with the value ``Tim.'' A reference to this object is placed in the local variable person. A quick check shows that the variable has indeed taken on the personality of a string, with an object id, a type, and a value. So, is a variable an object? In Ruby, the answer is ``no.

website generation '' A variable is simply a reference to an object. Objects float around in a big pool somewhere (the heap, most of the time) and are pointed to by variables. Let's make the example slightly more complicated. person1 = "Tim" person2 = person1 person1[0] = 'J' person1 » "Jim" person2 » "Jim" What happened here? We changed the first character of person1, but both person1 and person2changed from ``Tim'' to ``Jim.'' It all comes back to the fact that variables hold references to objects, not the objects themselves.

website generation

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website generation