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Goals Of WebAssemblyThe main objective of WebAssembly is to enable high-performance applications on web content, but the format is meant to be executed and integrated into other environments further.
- Be portable, fast and efficient — WebAssembly code is often executed at near-native speed across different platforms by taking advantage of general hardware capabilities.
- Be accessible to readable and debuggable — WebAssembly could be a low-level programming language. Still, it does have a human-readable text format (the specification that continues to be being finalized) that enables code to be reviewed, written and debugged by hand.
- Keep secure — Actually, WebAssembly is specified to be run during a safe and sandboxed execution environment. Like other web code, it' ll enforce the browser's same-origin and permissions policies.
- Don't break the Internet— WebAssembly is intended, so it plays nicely with other web technologies and maintains backwards compatibility.
- A virtual machine (VM) that runs the web applications code, e.g. the JS code that powers your apps.
- A set of Web APIs that a web application can call to regulate web browser/device functionality and make things happen (CSSOM, DOM, IndexedDB, WebGL, Web Audio API, etc.).
Key Concepts of WebAssemblyThere are many key concepts which we need to understand how WebAssembly runs in the browser They are-
- Memory: A resizable ArrayBuffer that contains the linear array of memory bytes read and written by WebAssembly’s low-level memory access instructions.
- Module: Represents a WebAssembly binary that has been compiled by the browser into executable computer code. A Module is stateless and thus, sort of a Blob, are often explicitly shared between workers and windows. A Module declares exports and imports.
- Table: A resizable typed array of references (e.g. to functions)that would not instead be kept raw bytes in MemoryMemory.
- Instance: A Module paired with all the state it uses at runtime including a Table, Memory and set of imported values.
How can WebAssembly be used?This point, we had talked about the raw primitives that WebAssembly adds to the online platform: a binary format to code and APIs for running and loading the system. Now let’s discuss how we are able to use these primitives in practice.The WebAssembly ecosystem is at a developing stage, and more tools will undoubtedly emerge going forward. Right now, we have four primary entry points:
- Porting a C/C++ software application with Emscripten.
- Generating or Writing a WebAssembly directly at the assembly level.
- Building a Rust app and target WebAssembly as its output.
- Using AssemblyScript which looks same as TypeScript and compiles to WebAssembly binary.