wam | WebAssembly Macro language and processor | Binary Executable Format library

A way to solve problems like this is to pretty-print the data in order to understand its layout. Once you've done that, it's usually fairly easy to determine how to access the value(s) you want.

I usually use json.dumps() or pprint.pprint() to do this. In this case I used the former:

Well, something has to free up multiply-referenced memory to which references exist that can be dropped at any step in the computation. This is the case independently of whether structures are cyclic or not.

Consider variables A and B naming the same structure in memory (they "name the same term"). The structure is referenced from 2 places. Suppose the predicate in which B is defined succeeds or fails. The Prolog Processor cannot just deallocate that structure: it is still referenced from A. This means you need at least reference counting to make sure you don't free memory too early. That's a reference counting garbage collector.

I don't know what kind of garbage collection is implemented in any specific Prolog implementation (there are many approaches, some better suited to Prolog than others ... in a not completely-unrelated context 25 years of Java have created all of these) but you need to use one, not necessarily a reference counting one.

(Cyclic structures are only special to garbage collection because reference counting garbage collection algorithms are unable to free up cyclic structures, as all the cells in a loop have a reference count of at least 1.)

(Also, an IMHO, never a trust a programming languages in which you have to call free yourself. There is probably a variation of Greenspun's tenth rule ("Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp.") in that any program written in a programming language in which you have to call free yourself contains an ad hoc, informally-specified, bug-ridden, slow implementation of a garbage collection algorithm.")

(OTOH, Rust seems to take kind of a middle way, offloading some effort onto the developer but having the advantage of being able to decide whether to free memory when a variable goes out of scope. But Rust is not Prolog.)

You have the order the wrong way around: You are building terms before you have built their arguments. The text says to build the arguments before you build the outer terms. For example, you must build a(K, C) before you can build h(..., a(K, C), ...), and you must build that before you can build p(..., h(..., a(K, C), ...), ...). Here is one legal order:

Think of WAM as a kind of machine code -- there are no symbol tables in the machine code, although there might be a separate section in the executable that provides information that a debugger or other tools1 can use to display values by name. Many Prolog implementations can also show the local variable names, but that's outside the scope of WAM.

Of course, a local symbol table is used when compiling a clause to WAM, but it's local to a single clause and there's non of the complications about scope that you see in conventional programming langauges.

Consider the following (using SWI-Prolog):

initial movie is an empty array and it will take some time to fetch from API. refactor to the below

I think you're overcomplicating. You can achieve what you want with simple python.

Suppose we have:

I agree with the others that it would help to get a sample of the data to check it out. from a first brief glance at your function I would assume that you use mapply in an unintended way. Your function addresses locations in the data frame directly. mapply , however, will pass only the columns to wamFunction.

You can check this doing this:

Finally managed to fix the issue ! Thanks to help from user Pauan in rust discord. My mistake is to not init WASM properly in JS.

the return value from await init('./front_bg.wasm') is the raw WebAssembly exports (which you generally shouldn't use) whereas the ./front.js module wraps those exports so that they will work properly so you have to use the functions defined in ./front.js, not the functions returned from init

see https://discordapp.com/channels/442252698964721669/443151097398296587/693385649750933564

Changed script tag in HTML to this one: