If my table has 100 columns, I would redefine that extension 100 times. (Count greaterThan 10) or (Count lessThan 5) lazy () is a function that takes a lambda and returns an instance of lazy which can serve as a delegate for implementing a lazy property: the first call to get () executes the lambda passed. '((name LIKE '%a%') OR (color IN ('yellow', 'red'))) AND ((count > 10) OR (count = where Where 'id' (number), 'name' (text), 'color' (text), and 'count' (number) are the columns, build a type-safe DSL for constructing WHERE clauses that can generate strings such as. Given the following SQL database table of fruits, With that in mind, I'll write this like an interview question =) So, here it goes! I'll try my best to keep this post a pure as possible so we can focus on the topic at hand. I want to get feedback on how I've done it and perhaps learn a different way of doing it. However, I feel like there are some internal improvements that I can make. I think I have the public facing API the way I want it.

The passed lambda or higher-order function should return the object of Template class ( T ).

It would not have been possible without Kotlin magic! lazy is a function defined in kotlin package which takes a lambda or higher-order function as a parameter and returns Lazy object.

A sequence represents lazily evaluated collections.

In the process of working on my open source project that deals with SQL databases, I have inadvertently created a DSL for constructing a WHERE clause. To create a lazy list, we need to convert the list into a sequence.

Kotlin by lazy with parameter