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What can be used instead of switch case?
Some alternatives to switch statements can be:
- A series of if-else conditionals that examine the target one value at a time.
- A lookup table, which contains, as keys, the case values and, as values, the part under the case statement.
Which is the alternative to switch in JavaScript?
object literals
Luckily, JavaScript provides another alternative for most use-cases I can think of for switch statements – object literals. The idea is to define an object with a key for each case you would have in a switch statement, then access its value directly using the expression you would pass to the switch statement.
What is true about DO statement?
What is true about do statement? Explanation: Do statement checks the condition at the end of the loop. Hence, code gets executed at least once. Explanation: Break is used with a switch statement to shift control out of switch.
Is it possible to refactor a switch statement?
Normally I refactor switch statements through polymorphism. You can still inject the desired behavior with an IoC. I’m with Sergio there, a switch statement can usually be replaced by the careful application of polymorphism.
How does a refactoring of a program work?
It works by applying a series of small steps, each of which changes the internal structure of the code, while maintaining its external behavior. You begin with a program that runs correctly, but is not well structured, refactoring improves its structure, making it easier to maintain and extend. Currently there is not much written on refactoring.
When to use refactoring to add a feature?
So this is where refactoring comes in. When you find you have to add a feature to a program, and the program�s code is not structured in a convenient way to add the feature; then first refactor the program to make it easy to add the feature, then add the feature. The obvious first target of my attention is the overly long statement () method.
Which is the first target of a refactoring?
The obvious first target of my attention is the overly long statement () method. When I look at a long method like that, I am looking to take a chunk of the code an extract a method from it.