function
Kotlin: Can you use named arguments for varargs?
To pass a named argument to a vararg parameter, use the spread operator: complicated(numbers = *intArrayOf(1, 2, 3, 4, 5))
Looking for an explanation of function composition
Function composition is a way to “compose” two functions together into a single function. Here’s an example: Say you have these functions: even :: Int -> Bool not :: Bool -> Bool and you want to define your own myOdd :: Int -> Bool function using the two above. The obvious way to do this … Read more
Why are “pure” functions called “pure”? [closed]
To answer your first question, mathematical functions have often been described as “pure” in terms of some specified variables. e.g.: the first term is a pure function of x and the second term is a pure function of y Because of this, I don’t think you’ll find a true “first” occurrence. For programming languages, a … Read more
How to define an function in the eshell (Erlang shell)?
Yes but it is painful. Below is a “lambda function declaration” (aka fun in Erlang terms). 1> F=fun(X) -> X+2 end. %%⇒ #Fun <erl_eval.6.13229925> Have a look at this post. You can even enter a module’s worth of declaration if you ever needed. In other words, yes you can declare functions.
How to evaluate functions in GDB?
The syntax for calling a function in gdb is call pow(3,2) Type help call at the gdb prompt for more information.
Scala return type for tuple-functions
def foo : (Int, String, String) = (1, “Hello”, “World”) The compiler will interpret the type (Int, String, String) as a Tuple3[Int, String, String]
Kotlin function declaration: equals sign before curly braces
Despite visual similarity, the idea of these two declarations is completely different. 1. Function declaration without equals sign Function declaration without equals sign is a Unit-returning function (similar to Java’s void functions). What’s inside the curly braces is its body, which gets executed right on the function call. The function can be rewritten with Unit … Read more
How to avoid SQL injection in CodeIgniter?
CodeIgniter’s Active Record methods automatically escape queries for you, to prevent sql injection. $this->db->select(‘*’)->from(‘tablename’)->where(‘var’, $val1); $this->db->get(); or $this->db->insert(‘tablename’, array(‘var1’=>$val1, ‘var2’=>$val2)); If you don’t want to use Active Records, you can use query bindings to prevent against injection. $sql=”SELECT * FROM tablename WHERE var = ?”; $this->db->query($sql, array($val1)); Or for inserting you can use the insert_string() … Read more
Return multiple values from a function, sub or type?
You might want want to rethink the structure of you application, if you really, really want one method to return multiple values. Either break things apart, so distinct methods return distinct values, or figure out a logical grouping and build an object to hold that data that can in turn be returned. ‘ this is … Read more