Android Development with Kotlin

The noinline modifier

The noinline modifier is for function type parameters. It makes a specific argument be treated as a normal function type parameter (its calls are not replaced with the function literal body). Let's look at a noinline example:

    fun boo(f: ()->Unit) { 
        //... 
    } 
 
    inline fun foo(before: ()->Unit, noinline f: () -> Unit) { // 1 
        before() // 2 
        boo (f) // 3 
    } 

1. The noinline annotation modifier is before parameter f.
2. The before function will be replaced by the body of the lambda expression used as an argument.
3. f is noinline so it can be passed to the boo function.

Two main reasons to use the noinline modifier are as follows:

• When we need to pass a specific lambda to another function
• When we are calling the lambda intensively and ...