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Welcome! SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI; see our online demo. What's New Read more in the SpiderMonkey Blog SpiderMonkey Internals Understanding the engine O
Two Reasons Functional Style Is Slow in SpiderMonkey
Two Reasons Functional Style Is Slow in SpiderMonkey Programming JS in a functional style is often more elegant but comes at the cost of performance. In the past, part of that performance problem has been due to native, C++ implementations of the most-often used higher-order operations like Array.prototype.forEach and friends. In a call like arr.forEach(f), the passed in kernel function f ends up
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