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select case conditional expression; Ada [1] if condition then statements «else statements» end if: if condition 1 then statements elsif condition 2 then statements... «else statements» end if: case expression is when value_list 1 => statements when value_list 2 => statements ... «when others => statements» end case (if condition 1 then ...
In Raku, a sister language to Perl, for must be used to traverse elements of a list (foreach is not allowed). The expression which denotes the collection to loop over is evaluated in list-context, but not flattened by default, and each item of the resulting list is, in turn, aliased to the loop variable(s). List literal example:
In addition, Java contains instance initializers, which are anonymous blocks of code with no arguments that are run after the explicit (or implicit) call to a superclass's constructor but before the constructor is executed. C# initializes object fields in the following order when creating an object: Derived static fields; Derived static constructor
Conditional expressions and conditional constructs are features of a programming language that perform different computations or actions depending on whether a programmer-specified Boolean condition evaluates to true or false. IF..GOTO. A form found in unstructured languages, mimicking a typical machine code instruction, would jump to (GOTO) a ...
The foreach statement is derived from the for statement and makes use of a certain pattern described in C#'s language specification in order to obtain and use an enumerator of elements to iterate over. Each item in the given collection will be returned and reachable in the context of the code block.
Here a whole switch expression can be used to return a value. There is also a new form of case label, case L-> where the right-hand-side is a single expression. This also prevents fall through and requires that cases are exhaustive. In Java SE 13 the yield statement is introduced, and in Java SE 14 switch expressions become a standard language ...
In such case it is always possible to use a function call, but this can be cumbersome and inelegant. For example, to pass conditionally different values as an argument for a constructor of a field or a base class, it is impossible to use a plain if-else statement; in this case we can use a conditional assignment expression, or a function call ...
If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.