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- Question: typescript check if value is in enum
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typescript check if value is in enum
To check if a value is in an enum in TypeScript, you can use the in
operator or the hasOwnProperty
method. Here’s an example:
typescriptenum Fruit { Apple = "apple", Banana = "banana", Orange = "orange" } const myFruit = "banana"; if (myFruit in Fruit) { console.log(`${myFruit} is a valid fruit in the Fruit enum`); } if (Fruit.hasOwnProperty(myFruit)) { console.log(`${myFruit} is a valid fruit in the Fruit enum`); }
In this example, we define an enum Fruit
with three values. We then define a variable myFruit
with the value "banana"
. We use the in
operator to check if myFruit
is a valid value in the Fruit
enum. Alternatively, we use the hasOwnProperty
method to check if the Fruit
enum has a property with the value of myFruit
. If either check is true, we log a message to the console indicating that myFruit
is a valid fruit in the Fruit
enum.
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Check value in enum TypeScript
To check the value of an enum in TypeScript, you can compare it to a specific enum member using the identity operator ===
. For example, let’s say you have the following enum:
typescriptenum Direction { Up, Down, Left, Right, }
You can check if a variable direction
has the value Direction.Up
like this:
typescriptconst direction = Direction.Up; if (direction === Direction.Up) { console.log("Direction is up!"); } else { console.log("Direction is not up."); }
This will output “Direction is up!” because the direction
variable has the value Direction.Up
.
Alternatively, you can also use the switch
statement to check for the value of an enum member like this:
typescriptconst direction = Direction.Down; switch (direction) { case Direction.Up: console.log("Direction is up!"); break; case Direction.Down: console.log("Direction is down!"); break; case Direction.Left: console.log("Direction is left!"); break; case Direction.Right: console.log("Direction is right!"); break; default: console.log("Unknown direction!"); break; }
This will output “Direction is down!” because the direction
variable has the value Direction.Down
.
Check value in enum C#
To check if a value is defined in an enum in C#, you can use the Enum.IsDefined method. Here is an example:
csharpenum DaysOfWeek { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } bool isDefined = Enum.IsDefined(typeof(DaysOfWeek), "Monday"); Console.WriteLine(isDefined); // output: True isDefined = Enum.IsDefined(typeof(DaysOfWeek), "InvalidValue"); Console.WriteLine(isDefined); // output: False
In this example, we define an enum called DaysOfWeek
and then use the Enum.IsDefined
method to check if the value "Monday"
is defined in the enum. The IsDefined
method returns true
if the value is defined in the enum, and false
otherwise. We then test the method with an invalid value, which returns false
.
Note that the second argument of the Enum.IsDefined
method is a string representing the name of the value you want to check, not the actual value itself. If you want to check if a particular integer value is defined in the enum, you can cast the integer value to the enum type before passing it to the IsDefined
method.
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