Kotlin: this expression in nested unnamed functions

Question

The Kotlin documentation describes how to access this expressions in nested classes.

Is it possible to access this expressions in nested unnamed functions? e.g:

str = "abcde"
str.run {                                                                                                                                                                                              
this.substring(0..2).run {                                                                                                                                                                         
    println("${this} is a substring of ${???}")                                                                                                                                                    
}

Qaz · Accepted Answer · 2018-02-17 05:25:01Z

4

Just for the sake of answering the question as asked, for situations where this can improve readability, you can use a label:

str.run outer@ { // Define a label
    this.substring(0..2).run {
        println("${this} is a substring of ${this@outer}") // Use the label
    }
}

Oftentimes, you'll have implicit labels to use. For example, if the outer call is changed to use a different function name from the inner call, you can access it:

with (str) {
    this.substring(0..2).run {
        println("${this} is a substring of ${this@with}") // Use the implicit label
    }
}

answered Feb 17, 2018 at 5:25

Qaz

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