Haskell does not provide any facility of looping any expression for more than once. Recursion is a situation where a function calls itself repeatedly. The roots of our Polynomial equation are: The above piece of code will generate the following output − Hence, we are breaking the expression using the where clause. Notice the complexity of our expression to calculate the roots of the given polynomial function. PutStrLn "The roots of our Polynomial equation are:" Roots :: (Float, Float, Float) -> (Float, Float) In the following code, we have modified our factorial program by using the concept of guards. For first-time users, guards can look very similar to If-Else statements, but they are functionally different. In pattern matching, we usually match one or more expressions, but we use guards to test some property of an expression.Īlthough it is advisable to use pattern matching over guards, but from a developer’s perspective, guards is more readable and simple. Guards is a concept that is very similar to pattern matching. Our code will produce the following output − When the pattern of the argument exactly matches with 0, it will call our pattern which is "fact 0 = 1". If the argument is not equal to 0, then the number will keep on calling the same function with 1 less than that of the actual argument. The compiler will start searching for a function called "fact" with an argument. We all know how to calculate the factorial of a number. Here we have used the technique of Pattern Matching to calculate the factorial of a number. Pattern Matching can be considered as a variant of dynamic polymorphism where at runtime, different methods can be executed depending on their argument list. If-Else can be used as an alternate option of pattern matching. This technique can be implemented into any type of Type class. It is nothing but a technique to simplify your code. Pattern Matching is process of matching specific type of expressions. Our code will generate the following output − Like most other languages, Haskell starts compiling the code from the main method. Here, we have declared our function in the first line and in the second line, we have written our actual function that will take two arguments and produce one integer type output. PutStrLn "The addition of the two numbers is:" Add :: Integer -> Integer -> Integer -function declaration
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