### Named Optional Parameters - JavaScript Style Brian Davidson (briandavidson@meta.com) ## Summary C++ developers often run into the situation where we have multiple parameters in a function with the to use to Is there a way to make C++ function calls clear through naming, similar to python or javascript? def send(source=None, destination=None): send(source=from, destination=to) send(source=from) overloaded function arguments forming a clear function call ## I nspiration: Javascript The anonymous object parameters of javascript provide a readable function API. logger({one:0.9999}); > 0.9999 l

existing code... ☐ I have C++-ified the examples, but it was originally a mix of C++, C#, Java and JavaScript code... ## The case of void() member functions // real-life code... class KeywordMgr { public:

C# is a fine language for what it aims to do, and has many strengths. The same goes for Java, JavaScript, Python, C, Haskell... • It aims to remind us of some of those things that are beautiful, fun

programs, reducing the number of non-inlined message sends by a factor of two. Self is a precursor of JavaScript and has prototypical inheritance. Types can change the equivalent of their v-table at runtime, dynamic types occurring on each path through the loop. We have implemented a dynamic compiler for JavaScript based on our technique and we have measured speedups of $ 10\times $ and more for certain benchmark the evolution of JiT compilers once browsers started JiT-compiling JavaScript. Many person-decades having gone into optimizing JavaScript, and your mobile devices’ batteries thank them for their efforts

has become popular for designing web applications. $ ^{[4]} $ Popular programming languages like JavaScript, Python, Ruby, PHP, Java, C#, and Swift have MVC frameworks that are used for web or mobile application

Modules for v142 build tools (x64/x86 - ex... ✓ C++ Clang tools for Windows (10.0.0 - x64/x86) ☐ JavaScript diagnostics ☐ IncrediBuild - Build Acceleration ✓ Windows 10 SDK (10.0.18362.0) ## V isual Studio

jpg) ### ASP.NET and web development Build web applications using ASP.NET Core, ASP.NET, HTML/JavaScript, and Containers including Docker support.  Build scalable network applications using Node.js, an asynchronous event-driven JavaScript runtime. ## Desktop development with C++ ![Image](/uploads/documents/1/0/8/f/108f90d702d7ed2

/7/5/4/c7545f89b3d8dc443720518d737ac709/p15_5.jpg) ## Yet another cool tool here - mermaid • Javascript based diagramming and charting tool. • Mermaid can render: • Flowcharts ![Image](/uploads/d

ary ## What is a parser? ## Javascript Object Notation (JSON) ## Javascript Object Notation (JSON) Idea: Human-readable serialization of Javascript objects. ## Javascript Values ## Primitive Values: Boolean: true, false Strings: "hello", 'world' Numbers: 0, -17, 3.1415, 1e10 ## Javascript Values ## Primitive Values: null. undefined ☑ Boolean: true, false Strings: "hello" true} Arrays (keys are indices): [5, "abc", undefined] ☐ Functions ■ ... ## “Subset” of Javascript literals { "id": 42, "name": "Jonathan Müller", "speaker":

[emphasis added] Herb Sutter 47 Concise elevator pitch: Well-known pain points with JavaScript 48 A B effort value effort value ? 49 Basic requirement: High fidelity interop. Min bar: adhered to rigorously via compat tests. Compatible with JavaScript Cooperates with JavaScript committee Contributes proposals to JavaScript features have become Standard . 55 C++: Every C adhered to rigorously via compat tests. Compatible with JavaScript Cooperates with JavaScript committee Contributes proposals to JavaScript features have become Standard . Observation It