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Kotlin

Kotlin

is !is

- is !is:

if (obj is String) {
    print(obj.length)
}

if (obj !is String) { //     !(obj is String)
    print("Not a String")
}
else {
    print(obj.length)
}

, Kotlin , is- , .

fun demo(x: Any) {
    if (x is String) {
        print(x.length) // x    String
    }
}

, , (!is) :

    if (x !is String) return
    print(x.length) // x    String

, && ||:

    // x    String   `||`
    if (x !is String || x.length == 0) return

    // x is    String   `&&`
    if (x is String && x.length > 0) {
        print(x.length) // x    String
    }

when- while:

when (x) {
    is Int -> print(x + 1)
    is String -> print(x.length + 1)
    is IntArray -> print(x.sum())
}

, , . , :

""

, . , . Kotlin as:

val x: String = y as String

, null String, String nullable, .. y - null, . Java, nullable :

val x: String? = y as String?

"" (nullable)

, as?, null :

val x: String? = y as? String

, , as? non-null String, nullable.

Kotlin     PHP       WEB       3GL   4GL   5GL      

Kotlin

is !is

- is !is:

if (obj is String) {
    print(obj.length)
}

if (obj !is String) { //     !(obj is String)
    print("Not a String")
}
else {
    print(obj.length)
}

, Kotlin , is- , .

fun demo(x: Any) {
    if (x is String) {
        print(x.length) // x    String
    }
}

, , (!is) :

    if (x !is String) return
    print(x.length) // x    String

, && ||:

    // x    String   `||`
    if (x !is String || x.length == 0) return

    // x is    String   `&&`
    if (x is String && x.length > 0) {
        print(x.length) // x    String
    }

when- while:

when (x) {
    is Int -> print(x + 1)
    is String -> print(x.length + 1)
    is IntArray -> print(x.sum())
}

, , . , :

""

, . , . Kotlin as:

val x: String = y as String

, null String, String nullable, .. y - null, . Java, nullable :

val x: String? = y as String?

"" (nullable)

, as?, null :

val x: String? = y as? String

, , as? non-null String, nullable.

Kotlin     PHP       WEB       3GL   4GL   5GL         w  

, - , , , . , , , . , , , . , , . , , , . , , , .




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