![]() Partial functions, Multiple Argument functions, Composite functions (one argument and multiple arguments), Unary functions, Lambda functions, Parenthesised functions, Dollared functions, Point-free style of functions. ord) codeįirstTo n = find ( \x -> digitSum x = n) IsIn needle haystack = any (isPrefixOf needle) (tails haystack)Įncoder offset msg = map ( \c -> chr $ ord c offset) msgĭecoder offset code = map (chr. Needle in the haystack - whole list comparison in another list: List_till_number x = list_till_number (x - 1) įib_series x = map fibonacci (list_till_number x) Lambda expressions: indicated in parenthesis by \įibonacci n = fibonacci (n - 1) fibonacci (n - 2) ZipWith' f (x :xs) (y :ys) = f x y : zipWith' f xs ys Lets make a higher order programming implementation of standard zipWith Function Now we have seen a function getting returned, now let us see a function going in! sectioning is done by bounding the function in parenthesis where an operand is missing and when we supply the operand at the side by a space, the compiler adds this operand in the missing place and produces the desired result. Applications of partial functions in infix functions format using sections It means that it is a partial function of foo, and a single parameter can be passed to foobar that will multiply with 5 and produce a result If i now define a new function called foobar like follows: Example of sectioning a regular function In the above example, compare 100 will take 100 and produce a partial fraction that again takes an integer and compares with 100 and returns the valid ordering. Example of higher order functions and partial function Whenever a function in which more than one parameters are needed, the main funtion first takes only the first input and then creates a partial function that again takes the next parameter and does the function and then sends the new partial fraction until all the parameters are used and a useful answer is generated by the function. Whenever there are more than one parameter involved, curried functions are called to accomodate multiple parameters Every Haskell function only takes one parameter. Higher order functions usually take functions as parameters and or or return functions as return types HIGHER ORDER FUNCTIONS - SHIT'S GONNA GET MORE REAL!. recursive implementation of elem function Zip' (x :xs) (y :ys) = (x, y) :zip' xs ys Recursive solution for zip function implementation Recursive solution for replicate function implementation Maximum' = error "Not on an empty list you fool! " Function to produce the maximum element in a List "ĬalcBmis :: ( RealFloat a ) => -> ĬalcBmis xs = [ bmi w h | (w, h) a -> a -> a Where can be used to reduce repetitions in a block of codeīmiTeller :: ( RealFloat a) => a -> a -> String > Make script snippets for all the learnt functions till nowĬompare' :: ( Ord a) => a -> a -> Ordering
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