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A JavaScript engine is a software component that executes JavaScript code. The first JavaScript engines were mere interpreters, but all relevant modern engines use just-in-time compilation for improved performance. [52] JavaScript engines are typically developed by web browser vendors, and every major browser has one.
A JavaScript engine is a software component that executes JavaScript code. The first JavaScript engines were mere interpreters, but all relevant modern engines use just-in-time compilation for improved performance. [1] JavaScript engines are typically developed by web browser vendors, and every major browser has one
SpiderMonkey: A JavaScript engine in Mozilla Gecko applications, including Firefox. The engine currently includes the IonMonkey compiler and OdinMonkey optimization module, has previously included the TraceMonkey compiler (first JavaScript JIT) and JägerMonkey. JavaScriptCore: A JavaScript interpreter and JIT originally derived from KJS.
[7] [8] Simultaneously, he designed the first SpiderMonkey engine, to execute the new language in the Navigator browser. When Mozilla inherited the Netscape base code in 1998, it included this engine, which was written in the C language. [9] It was then changed in JavaScript 1.5 to comply with the ECMA-262 standard.
Since ES 2015, transpiling JavaScript has become very common. Transpilation is a source-to-source compilation in which newer versions of JavaScript are used, and a transpiler rewrites the source code so that it is supported by older browsers. Usually, transpilers transpile down to ES3 to maintain compatibility with all versions of browsers.
Netscape introduced an implementation of JavaScript for server-side scripting with Netscape Enterprise Server, first released in December, 1994 (soon after releasing JavaScript for browsers). [1] [2] Server-side scripting was later used in early 1996 by Fred Dufresne while developing the first website for Boston, MA television station WCVB.
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