The problem is that variables declared in one case are still visible in the subsequent cases unless an explicit { } block is used, but they will not be initialized because the initialization code belongs to another case. In the following code, if foo equals 1, everything is ok, but if it equals 2, we’ll accidentally use the i variable which does exist but probably contains garbage. Wrapping … Read more
Change it to this: The clue is in the error. You don’t need to qualify case labels with the enum type, just its value.
Ruby uses the case expression instead. Ruby compares the object in the when clause with the object in the case clause using the === operator. For example, 1..5 === x, and not x === 1..5. This allows for sophisticated when clauses as seen above. Ranges, classes and all sorts of things can be tested for rather than just equality. Unlike switch statements in many other languages, Ruby’s case does not have fall-through, so … Read more
Remove the course_enrollment_settings.base_price immediately after CASE: CASE has two different forms, as detailed in the manual. Here, you want the second form since you’re using search conditions.
This question already has answers here: Replacements for switch statement in Python? Is there a Python equivalent for the case statement such as the examples available in VB.NET or C#?
Python 3.10 and above In Python 3.10, they introduced the pattern matching. Example from the Python Docs: Before Python 3.10 While the official docs are happy not to provide switch, I have seen a solution using dictionaries. For example: Then the equivalent switch block is invoked: This begins to fall apart if you heavily depend on fall through.
The reason why has to do with the type system. C/C++ doesn’t really support strings as a type. It does support the idea of a constant char array but it doesn’t really fully understand the notion of a string. In order to generate the code for a switch statement the compiler must understand what it … Read more
The original answer below was written in 2008. Since then, Python 3.10 (2021) introduced the match–case statement which provides a first-class implementation of a “switch” for Python. For example: The match–case statement is considerably more powerful than this simple example. You could use a dictionary: