CanBeNonNullable.md

Pattern: Use of nullable variable

Issue: -

Description

This rule inspects variables marked as nullable and reports which could be declared as non-nullable instead.

Example of incorrect code:

class A {
    var a: Int? = 5

    fun foo() {
        a = 6
    }
}

class A {
    val a: Int?
        get() = 5
}

fun foo(a: Int?) {
    val b = a!! + 2
}

fun foo(a: Int?) {
    if (a != null) {
        println(a)
    }
}

Example of correct code:

class A {
    var a: Int = 5

    fun foo() {
        a = 6
    }
}

class A {
    val a: Int
        get() = 5
}

fun foo(a: Int) {
    val b = a + 2
}

fun foo(a: Int) {
    println(a)
}

Further Reading

• Detekt - CanBeNonNullable