![]() ![]() The above is a practical solution that is the basis for the more elaborate approaches given below. We might address that with this minor change: This improves performance but has the side-effect of moving the lookup table further from its usage. Note how the table construction was placed outside the block to avoid recreating the table for each use (table constructions cause heap allocations). = function() return is_canadian and "eh" or "" endįor _,v in ipairs(letters) do local s = type(t) = "function" and t() or t or "blah" print(s)Ĭ compilers can optimize the switch statement in a roughly similar way via what is called a jump table, at least under suitable conditions. Z = function() return is_canadian and "zed" or "zee" end, If we rewrite this as a lookup table, the code can run in linear-time, O(M), and without the redundancy so that the logic is easier to modify at whim: These concerns (minor as they may be) have been noted elsewhere as well ( ). A more minor concern is the syntax redundancy of having " v =" for each test. If the number of elements in letters is M and the number of tests is N, then the complexity is O(M*N), or potentially quadratic. When there are many tests as such, the comparison chain is not always the most efficient. Local is_canadian = false function sayit(letters)įor _,v in ipairs(letters) do if v = "a" then print( "aah")Įlseif v = "z" then print(is_canadian and "zed" or "zee")Įlseif v = "?" then print(is_canadian and "eh" or "") The first question to ask is why we might want a switch statement rather than a comparison chain as such: There are ways to emulate the same effect as discussed here. This issue has come up a number of times on the mailing list. Let us consider an example to return a variable in Java.Lua-users wiki: Switch Statement Switch Statement IIT-ISM is the best Engineering college in was established in How to Return a Variable in Java Programming? ("IIT-ISM is the best Engineering college in India.") Ĭollege cg = new College() // using first approach. Declare a method with return type College class. Let’s take an example program where we will use both approaches to return the same class object. You can also return a value direct using “ this” keyword which represents the current class object. But at the project level, it is always recommended to use the second approach. If the method’s return type is a current class, you create an object of the class and return object reference variable.Ģ. There are two ways to return the current or same class object.ġ. ![]() int m1() Ways to return current/same class object If you are not returning any value, it will generate an error message like ” missing return statements “. If a method is having int, double, float, etc other than void, we must return a value compatible with the declared return type by using the return statement. A return type void is used when there is no return value. Here, the void represents “return nothing”. Types of Methods Declaration based on Return type in Java When a return statement is used inside the method, the flow of execution comes out of it and goes back to the caller method. Thus, a return statement in java is used to return a value from a method. Now to calculate the square value and return it, we have used return statement (return num * num ) inside the square() method. We are passing a value 20 to the method at the time of calling from main method.į. After method name, we wrote int num as a parameter that receives an integer value into the method. int before a method name specifies the type of value returned by the method.Į. To get the result returned from the square() method, we have taken a variable “squareOfNumber” of type int as follows: int squareOfNumber = t.square(20). Inside the main() method, we are calling square() method using object reference variable t and passing 20 to it as follows: t.square(20).
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