Something like `if ((val localVal = nullableExpr) ...

# language-proposals

[ilya.gorbunov]

Something like if ((val localVal = nullableExpr) != null && localVal.property = "x") { do something with localVal } ?

[benleggiero]

Like this:

guard
    val localVal = nullableExpr
    && localVal.property == "x"
    else {
    println("nullableExpr was null")
    // localVal is nonexistant in this context
    return
}
// localVal is guaranteed in this context
doSomething(with = localVal)

or:

if
    val localVal = nullableExpr
    && localVal.property == "x" {
    // localVal is guaranteed in this context
    doSomething(with = localVal)
} else {
    // localVal is nonexistant in this context
    println("nullableExpr was null")
}

// localVal is nonexistant in this context