CastNullableToNonNullableType.md

Pattern: Cast of nullable to non-nullable type

Issue: -

Description

Reports cast of nullable variable to non-null type. Cast like this can hide null problems in your code. The compliant code would be that which will correctly check for two things (nullability and type) and not just one (cast).

Example of incorrect code:

fun foo(bar: Any?) {
    val x = bar as String
}

Example of correct code:

fun foo(bar: Any?) {
    val x = checkNotNull(bar) as String
}

// Alternative
fun foo(bar: Any?) {
    val x = (bar ?: error("null assertion message")) as String
}

Further Reading

• Detekt - CastNullableToNonNullableType