How do inline and Generic concepts relate in programming?

The concepts of inline and generic in programming address different tasks but are often used together, especially in Kotlin.

• Generic allows creating generalized functions and classes that work with different data types without duplicating code. For example, the function fun <T> printItem(item: T) can accept any type.

• Inline is a function modifier that, during compilation, inserts the function body in place of the call, reducing the overhead of function calls, which is especially useful when working with lambdas.

Together, they enable the creation of efficient generic functions with lambda parameters without performance loss. For example, inline generic functions are often used in Kotlin's standard library for collections.

Example:

inline fun <T> List<T>.customFilter(predicate: (T) -> Boolean): List<T> {
    val result = mutableListOf<T>()
    for (item in this) {
        if (predicate(item)) result.add(item)
    }
    return result
}

Here, inline reduces the overhead of lambda calls, and generic allows working with any list type.