... even though iB is passed into it. justTrue snatches the Int parameter from iB, and then calls an anonymous function which takes that Int and returns a true. By making use of type: type Set = Int => Boolean We can reduce the definition of justTrue to: def justTrue(iB : Set) : Set = (x : Int) => true Much better! And why does this work? Since we are taking an Int x which comes from iB, we are automatically returning a function.
0 Comments... true. If all elements in the set do not satisfy the predicate, exists returns false. Using anonymous functions, we can define exists as: def exists(s: Set, p: Int => Boolean): Boolean = !forall(s, (x: Int) => !p(x)) Why does this work? There are two steps involved here.
0 CommentsLambdas are simply anonymous functions for Python. We often don't want to write a whole new function with a name if the function itself only consists of one line of code. It is tedious, even though it might be less scary to see.
0 Comments... like C++, Java, or Python. Since functions are first-class, callbacks are possible, as well as anonymous functions and closures. Classes There is no such thing as a class statement like in other languages, because Javascript is a prototype-based language.
0 CommentsThe Many Uses of const with Operator Overloading const can be used in different ways depending on how an operator is overloaded. There are two major cases to consider: If an operator is overloaded as a nonmember function (not part of the class definition) If an operator is overloaded as a member function (part of the class definition) Case 1: Overloaded as a Nonmember Function Here is an example of the + operator overloaded as a nonmember function: const Weight operator +(const Weight& w1, const Weight& w2); Notice we have three positions where we can place const and each one means something different.
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