Engine262 - How to "RUN" the ecmascript specification? | Javascript engine
If you have tried reading the Ecmascript specification (javascript), a common problem is that you can't really run or debug parts of the specification to see how it works. So, you can run the code in a simple js engine like Engine262.
Using engine262, we will debug why `[ ] == ![ ]` evaluates to true.
00:00 Intro
01:11 Why is reading spec hard?
02:44 How to run specification?
02:57 Engine262 Intro
04:28 Setting up engine262
09:53 Run code within engine262
11:44 Parsing and evaluation step
12:53 See AST using astexplorer.net
14:05 How to find releveant sections in code and AST?
19:36 Evalate `![ ]`
21:12 [] == ! ToBoolean(true)
22:50 Evaluate `==`
23:40 From `[] == false` to `[] == 0`
25:51 From `[] == 0` to `"" == 0`
30:51 From `"" == 0` to `0 == 0`
32:34 which returns true
33:22 Using print() to console.log
34:09 Outro
Links -
1. LinkedIn post by Harish - https://www.linkedin.com/feed/update/...
2. Engine262 - https://github.com/engine262/engine262
3. ASTExplorer - https://astexplorer.net/
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