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kotlin scope functions

just-saved-you-a-stackoverflow-visit answered on January 31, 2021 Popularity 9/10 Helpfulness 3/10

answer kotlin scope functions

related scope functions in kotlin

kotlin scope functions

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     | object  lambda
-----+----------------
this | apply    run
it   | also     let

Popularity 9/10 Helpfulness 3/10 Language kotlin

Source: Grepper

Tags: kotlin scope

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Contributed on Jan 31 2021

just-saved-you-a-stackoverflow-visit

0 Answers Avg Quality 2/10

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scope functions in kotlin

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        - let
            . return (lambda expersion)
            . context object (it)
            . "generally used to avoid NullPointerException"

            @with out lambda expersion
                # val name:String? = null
                # 
                # name?.let {
                #     println(it.reversed())
                #     println(it.capitalize())
                #     println(it.length)
                # }

            @with lambda expersion
                # val name:String? = "null"
                #
                # val stringLength = name?.let {
                #     println(it.reversed())
                #     println(it.capitalize())
                #     it.length
                # }
                # 
                # println(stringLength)


        - run
            . return (lambda expersion)
            . context object (this)
            . "this is the combination of "(with)"and"(let)"function"
            . "this is used to avoid null expection and do operation"

            @
                # val person:Person? = Person()
                #
                # val bio = person?.run {
                #     println(name)
                #     println(age)
                #     age+5
                #     "hy this is the run function"
                # }
                # println(bio)
                #
                # class Person{
                #     var name:String = "hannan"
                #     var age:Int = 18
                # }

    








    "summary"
        - with
            if you want to operate on a "non-null object"
        - let
            if you want to just execute lambda expression on a "nullable" object and avoid "nullpointereception"
        - run 
            if you want to operate on a "nullable" object,execute lambda expersion and avoid "NullPointerEception"
        - apply
            if you wnat ot initialise or configure an object
        - also
            if you want to do some additional object configuration or operations

Popularity 8/10 Helpfulness 1/10 Language kotlin

Source: Grepper

Tags: kotlin ko

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Contributed on Aug 26 2022

Anil Kumar Sahoo

0 Answers Avg Quality 2/10

kotlin scope functions

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