If the function is only used once, or a limited number of times, an anonymous function may be syntactically lighter than using a named function. lambda expression in c# pdf, before electronic computers, in which all functions are anonymous.
1958, and a growing number of modern programming languages support anonymous functions. Anonymous functions can be used for containing functionality that need not be named and possibly for short-term use. Use of anonymous functions is a matter of style. Some programmers use anonymous functions to encapsulate specific, non-reusable code without littering the code with a lot of little one-line normal functions.
In some programming languages, anonymous functions are commonly implemented for very specific purposes such as binding events to callbacks, or instantiating the function for particular values, which may be more efficient, more readable, and less error-prone than calling a more-generic named function. When attempting to sort in a non-standard way, it may be easier to contain the comparison logic as an anonymous function instead of creating a named function. The following example binds the variable “threshold” in an anonymous function that compares the input to the threshold. It would be impractical to create a function for every possible comparison function and may be too inconvenient to keep the threshold around for further use. Regardless of the reason why a closure is used, the anonymous function is the entity that contains the functionality that does the comparing. While the use of anonymous functions is perhaps not common with currying, it still can be used.
In the above example, the function divisor generates functions with a specified divisor. The functions half and third curry the divide function with a fixed divisor. The divisor function also forms a closure by binding the “d” variable. This section describes some of them.
The map function performs a function call on each element of a list. The filter function returns all elements from a list that evaluate True when passed to a certain function. The anonymous function checks if the argument passed to it is even. The anonymous function here is the multiplication of the two arguments. The result of a fold need not be one value. Instead, both map and filter can be created using fold. In map, the value that is accumulated is a new list, containing the results of applying a function to each element of the original list.