racket Functions The `apply` function
The major advantage of apply is that it works on arbitrary computed lists, including appended lists and lists that come from function arguments.
Likewise, what is Check expect in racket?
A check-expect expression must be placed at the top-level of a student program. Also it may show up anywhere in the program, including ahead of the tested function definition. … It is an error for expr or expected-expr to produce an inexact number or a function value.
Correspondingly, what is lambda in racket?
In Racket (and other functional programming languages) lambda s are very useful, when you want to pass an in-line, one-shot function as a parameter without defining it first. For example, suppose that we want to square a list of numbers.
What is begin in racket?
Begin takes an arbitrary number of expressions and executes each one of them but only returns the result of the last expression in the body. https://stackoverflow.com/questions/29382733/racket-begin-form/29387064#29387064.
Symbols in The Racket Guide introduces symbols. A symbol is like an immutable string, but symbols are normally interned, so that two symbols with the same character content are normally eq?. All symbols produced by the default reader (see Reading Symbols) are interned.
BSL programming is basically prefix syntax for pre-algebra plus a range of pre-defined functions. In contrast to your pre-algebra courses, your BSL expressions and functions definitions are mechanically checked and, if they are found to be ill-formed, you get an error message.
A helper function is a function that performs part of the computation of another function. Helper functions are used to make your programs easier to read by giving descriptive names to computations. They also let you reuse computations, just as with functions in general.