7. First 3 big word alerts #

Created Sunday 20 February 2022

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The first 3 “big word alerts” to be discussed in this video are:

1. Syntax Parsers
2. Execution Contexts
3. Lexical Environments

What are these things, let’s see:

1. Syntax Parser - a program that reads source code and checks syntax. It may do extra stuff too, if specified by the syntax parser’s creators.
2. Lexical Environment - the tree structure of scopes.
3. Execution Context - the current stack frame.

I was confused between 2 and 3, as the course author does not use the word ‘activation record’ or ‘frame.’ This cleared it.

These things are important. They’ll help us understand what’s going inside JavaScript.