How to call a function with a parameter in another function in kotlin

Question

I have function which returns some value. In the function parameter I pass the same value:

 fun getValue (value:String):String {
        var message = value
        value = "Hello"
        return message
    }

How can I call getValue function in another function? For example:

fun getResult (){
var a = getValue (what here?)
}

For example with a string literal: var a = getValue ("Hello"). Also note that the assignment value = "Hello" inside the getValue function is useless. What did you intend to achieve? — Henry
– Henry, Commented Dec 28, 2020 at 9:20
But when I call getValue method I need in resalt var a = message — Julia
– Julia, Commented Dec 28, 2020 at 9:25

Reyhane Farshbaf · Accepted Answer · 2020-12-28 10:39:17Z

1

You can pass a function as a prameter for another function in kotlin. Kotlin functions can take other functions in arguments, or even return them.

fun getResult (func:(String) -> String) {
        //some code
        var a = func("some string")
    }

    fun getValue (value:String):String {
        var message = value
        return message
    }

and call getResult and pass function to it:

getResult({  getValue("Hello") })

edited Dec 28, 2020 at 10:39

answered Dec 28, 2020 at 9:30

Reyhane Farshbaf

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4 Comments

Julia Over a year ago

in this case here getResult(getValue("Hello")) I get error: Type mismatch. Required: (String) → String Found: String

Reyhane Farshbaf Over a year ago

@Julia Sorry , I edit and test my answer. Please try again.

Julia Over a year ago

but for example I get in message' (getValue` method) "DDD" value. How can I do that here var a = func("some string") I get "DDD"too?

Reyhane Farshbaf Over a year ago

@Julia I hope underastand your mean. If you mean return back result from getResult() function, e.g. a value, do like other function. It's enough to change type of return back in getResult() function. easily change to: fun getResult (func:(String) -> String):String { //TODO return a}. If my answer can help you and is correct, please accept it. Thanks tou if upvote useful comments too. Good Luck.

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