A chronic, itching, longing to ditch the tool and do the whole thing yourself inside a _ for- loop_. Its functions most commonly receive complex and recursive arguments: a parsed JSON is an array, or object, which usually contains further arrays and objects inside. How can one vizualise a DSL? might be the missing link http://moonbase.rydia.net/mental/writings/programming/monads-in-ruby/00introduction.html My brain needs to step through the code just as an interpreter would while also taking into account the context in which the code lives(another negativity of mutable data). We will iterate printableFields and generate table headers for each of them: Notice that we have just implemented iteration, the workhorse of HTML generation, and we didn’t need any DSL constructs; we only needed a function to iterate a data structure and return dsDSLs. What, If Anything, Is A Declarative Language? Look at all three of our examples above. Stand back, take a good look at your solutions, and notice the common patterns among them. Another less-spoken-of benefit to declarative code is that your program can be context-independent. In a nutshell, declarative programming consists of instructing a program on what needs to be done, instead of telling it how to do it. https://lhorie.github.io/mithril/ Some logical programming languages, such as Prolog, and database query languages, such as SQL, while declarative in principle, also support a procedural style of programming. Rather, by capturing the empiric patterns of repetition in the low level, a good high level tool allows us to understand fully the domain of applicability. The "path array" approach makes more sense if these attributes lists are generated automatically and then read again in an standard way - but that's another discussion. I understand what you say and it's entirely tree that using arrays of strings is more verbose (for both reading and writing) than just using a string with a dot as a separator. A proper critique of declarative programming would take considerable time, effort, and I would have to go back and use many of these tools; my heart is not in such an undertaking. An approach that worked well for me is to use arrays of strings to represent paths. The question is, why are some declarative tools so much more complex than they need be? Hi Antony! Now, the last claim is a strong one, so I’m going to spend the rest of this section supporting it. Both attributes and contents are optionals for any given tag. I would be very interested to read about similar developments in Haskell - or any language, for that matter. Here are some other definitions that I’ve found from around the web that may or may not be helpful. Let’s now see what this code is doing. React uses JSX, which is "a JavaScript syntax extension that looks similar to XML". - template application to list of attributes; e.g., names:bold() where template references can be recursive." A DSL never has the full power of a programming language. The core mistake, here, is to put business logic and presentation logic in the same bag. Am I going to drive an imperative stick shift car or a declarative automatic car? Or is all the work just done by front-end developers these days? As such, I think it belongs to the class of DSLs, and hence the arguments in the first part of the article are relevant. Imperative is definitely not the way to go and I think we're better off looking for tools that provide us with a high level layer on top of the imperative one. I completely agree with you - declarative tools that are expressed within the programming language itself (like the Wiremock example you pointed out) are tremendously powerful. In contrast to the imperative one, declarative programming is about describing what you're trying to achieve, without instructing how to do it. Both the inputs and the outputs of these functions can be contained and generated by a programming language without a separate syntax. That is, they cannot be passed or returned from functions. In the face of our limitations, we need to spend our time learning things that will be useful and withstand time, even in the face of fast changing technology. Putting such a "script" in and code block would make you think that the code is "imperative". I owe the clear formulation of this point to Alexei Boronine, who makes an excellent case for it in this article. Or when I can use Rosmaro (https://medium.com/dailyjs/state-machines-to-the-rescue-of-complex-forms-867b75790455) to model changes of behaviour in my code. ``` Federico is a full-stack JavaScript developer and open source contributor. This is not the case for ERB-inspired tools written in other languages since those templates must also be stored as different files.

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