Enum के Basics

एक enum किसी चीज़ के हर possible option को list करता है, जैसे हफ्ते के दिन, ताकि आप गलती से कुछ invalid न चुन लें।

In this page:

Defining an Enum
Using switch with an Enum

Syntax

swift

enum EnumName {
    case first, second, third
}

let value = EnumName.first

switch value {
case .first: /* code */
case .second: /* code */
case .third: /* code */
}

Defining an Enum

एक enum case के साथ possible values का एक closed set declare करता है, हर option को एक clear, named identity देते हुए।

उदाहरण: Defining an Enum

markup

// Define an enum `Direction` listing its possible cases
enum Direction {
    // Enum case(s): `north, south, east, west`
    case north, south, east, west
}
// Declare a constant `heading`, set to `Direction.north`
let heading = Direction.north
// Print `heading` to the console
print(heading)

Using switch with an Enum

चूंकि switch exhaustiveness चाहता है, किसी enum के cases match करना एक natural fit है और compiler सुनिश्चित करता है कि हर case handle हो।

उदाहरण: Using switch with an Enum

markup

// Define an enum `Direction` listing its possible cases
enum Direction {
    // Enum case(s): `north, south, east, west`
    case north, south, east, west
}
// Declare a constant `heading`, set to `Direction.east`
let heading = Direction.east
// Switch on `heading` and branch by case
switch heading {
// Case: `.north`
case .north:
    // Print "Heading north" to the console
    print("Heading north")
// Case: `.south`
case .south:
    // Print "Heading south" to the console
    print("Heading south")
// Case: `.east`
case .east:
    // Print "Heading east" to the console
    print("Heading east")
case .west:
    print("Heading west")
}

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Enum के Basics

Defining an Enum

Using switch with an Enum

Chapter Quiz — Complete all 6 topics to unlock

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