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Questions tagged [javascript-engine]

For questions related to JavaScript engine development. If you are simply referring to issues with JavaScript code, use the [javascript] tag instead.

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JavaScript: What is the data structure for the call stack?

I'm writing an article about JS concurrency model and event loop. I've read many (even internally) conflicting articles regarding the data structures of the call stack and Execution Contexts. A JavaScript engine like Google's V8 is composed of two…
André Casal
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Chrome versus Edge Javascript differences

From time to time i get Javascript Files (created by use of Adobe Animate) that crashes in either chrome or edge. In some cases these files crash only in chrome, in some cases they crash only in edge. Its always RangeError: "Maximum call stack size…
fkc-ik
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What is `delete()`?

When I use delete keyword as a function it returns boolean and if I pass anything it doesn't throw error const foo = 0 delete(foo) // false const bar = 1 delete(bar) // false delete(unknown) // true delete(5) // true I don't understand this…
Ibrahem Alhofe
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Does JavaScript code converted to assembly code?

I read article about how JavaScript Engine works, but there is thing that confusing me, it says the following: JavaScript code first parsed The source code translated to bytecode The bytecode gets optimized The code generator takes bytecode and…
Hayk
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How do I evaluate JavaScript before the browser does?

I am looking for a way to get javascript code before SpiderMoney (Firefox JS engine) or V8 (Chrome JS engine) evaluate the it. I don't mean capturing the traffic and get it before the application does, but "hijacking" the javascript before it…
TCS
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JavaScript var scoping in strict mode

So since ES6 all functions are block scoped in strict mode, but "var" ignores block scope, then why code below gives a reference error? 'use strict' function asd() { var ssss = 5; } console.log(ssss); //reference error for (const item of arr) { …
randomCoder
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Are functions kept only once in memory in JavaScript?

Before asking my question let me give you some information. See this piece of code "use strict" function outer() { let counter = 0; function incrementCounter() { counter++; console.log(counter); } return…
Mesut Çiftçi
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Is a browser's console an interface to the web API?

From my research, the browser gives us some features that the JavaScript engine itself doesn’t provide: a Web API. This includes the DOM API, setTimeout, HTTP requests, and so on. So because browsers run functions that are not supported in the…
Mark Wild
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Do Javascript engines do this kind of optimisation?

NB I've done a bit of reading about JS engine optimisation, but most of it is too technical for me to understand enough to apply to this question. I'm also aware that not all engines are the same. I'd be interested in particular in handling by V8…
mike rodent
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object caching in modern JavaScript?

I'm preparing to take a JavaScript test, and came upon this post: http://www.javascriptkit.com/javatutors/efficientjs.shtml The gist is that this: