V7 VS Duktape

Compare V7 vs Duktape and see what are their differences.

V7

Embedded JavaScript engine for C/C++ (by cesanta)

Duktape

Duktape - embeddable Javascript engine with a focus on portability and compact footprint (by svaarala)
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V7 Duktape
1 3
1,344 5,240
1.0% -
0.4 7.9
over 1 year ago 30 days ago
C JavaScript
GNU General Public License v3.0 or later MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

V7

Posts with mentions or reviews of V7. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-06-28.
  • JavaScript Is Weird
    7 projects | news.ycombinator.com | 28 Jun 2021
    https://github.com/cesanta/v7

    Languages are not all equal nor do they all function in the same way, and that's not my opinion.

    Javascript syntax itself is one thing, and you can certainly feel free to Javascriptify some C++ libraries and make it all look a certain way for specific tasks, while managing things behind the scenes, up to a point... but there is no getting around the fact that SOMEONE and some languages are needed to implement low level systems functionality.

    the power of Cython or the Python C FFI is that it allows you to script/glue modular native code.

    You then state "C++14 may have been ratified 7 years ago but it's not the target code your build chain spits out"

    no, a C++ COMPILER spits out assembler code that then gets assembled and linked into an executable.

    The C++ or C code corresponds directly to a given set of assembler instructions which correspond directly to CPU instructions.

    You claim that Python programming of microcontrollers is mainstream, but this is not true nor possible. Python SCRIPTING of code modules (that cannot be written in Python) is certainly one way to assemble a system from pre-built legos.

    If you refer to knowing what I'm talking about as gatekeeping and egoism, might I suggest that you insist less forcefully in the correctness of incorrect things you state? we could be done with this spat in short order if YOU would refrain from speaking falsehoods. lies.untrue things.

    I look forward to your lisp c compiler. make sure that it's 100% lisp from the bottom up, or I'll consider you're having ceded my point. Consider that the lisp you author in has a garbage collection system that lisp cannot have written originally, nor has any semantics for the underlying memory structures of, but hey, I guess if one is committed to pretending that all languages are equal for all tasks, who am I to question ones self-identification with a given language.

Duktape

Posts with mentions or reviews of Duktape. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-03-30.
  • Optimizations Enabled by -ffast-Math
    1 project | news.ycombinator.com | 20 Oct 2021
    Fast math optimizations can break code like this by breaking isNaN.

    I was porting a C++ project to a certain platform - and that platform enabled a -ffast-math equivalent by default in Release (but not Debug) builds! This broke duktape, a JS engine said project embedded, in some nasty and subtle ways. Instead of storing a number/pointer/??? (8 bytes) + type tag (4? bytes) for each dynamically typed JS value, duktape can bit-pack values into a single 8 byte "double" value by storing object/string handles as NaN values - this isn't an uncommon trick for dynamically typed scripting stuff:

    https://github.com/svaarala/duktape/blob/c3722054ea4a4e50f48...

    Naturally, the -ffast-math equivalent broke isNaN checks, which caused random object/string handles to be mistakenly reinterpreted as "numbers" - but only in Release builds, for this one particular platform, in one rarely taken branch, so neither QA nor CI caught it, leading to hours of manufacturing a repro case, stepping through an absurd amount of code, and then finally looking at the default build rules and facepalming.

    Cursing the platform vendor under my breath, I overrode the defaults to align with the defaults of every other config x platform combination we already had: no fast math. If you want those optimizations, use SSE-friendly NaN-avoiding intrinsics - or, if you must use the compiler flags, ensure you do so consistently across build configs and platforms, perhaps limited to a few TUs or modules if possible. This allows you to have a chance at using your Debug builds to debug the resulting "optimizations".

  • Can C++ and JS be used together?
    1 project | reddit.com/r/learnprogramming | 27 Apr 2021
    Sure. For example, DukTape is an implementation of Javascript designed to be embedded in other projects. Google's V8 Javascript engine (used in Chrome), can also be embedded, see Node.Js for example.
  • [AskJS] Do you use JavaScript on Microcontrollers? Which engine / interpreter?
    5 projects | reddit.com/r/javascript | 30 Mar 2021
    - Duktape (4.8k stars)

What are some alternatives?

When comparing V7 and Duktape you can also consider the following projects:

V8 - The official mirror of the V8 Git repository

Lua - Lua is a powerful, efficient, lightweight, embeddable scripting language. It supports procedural programming, object-oriented programming, functional programming, data-driven programming, and data description.

quickjs - Public repository of the QuickJS Javascript Engine. Pull requests are not accepted. Use the mailing list to submit patches.

jerryscript - Ultra-lightweight JavaScript engine for the Internet of Things.

ChaiScript - Embedded Scripting Language Designed for C++

SWIG - SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.

squirrel - Official repository for the programming language Squirrel

ChakraCore - ChakraCore is an open source Javascript engine with a C API. [Moved to: https://github.com/chakra-core/ChakraCore]

Wren - The Wren Programming Language. Wren is a small, fast, class-based concurrent scripting language.

sol2 - Sol3 (sol2 v3.0) - a C++ <-> Lua API wrapper with advanced features and top notch performance - is here, and it's great! Documentation: