ast

A grammar describes the syntax of a programming language, and might be defined in Backus-Naur form (BNF). A lexer performs lexical analysis, turning text into tokens. A parser takes tokens and builds a data structure like an abstract syntax tree (AST). The parser is concerned with context: does the sequence of tokens fit the grammar? A compiler is a combined lexer and parser, built for a specific grammar.

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new class extends class {} {
  constructor() {
    super();
    return 3;
  }
}

[repl](https://babeljs.io/repl#?browsers=&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=HYUw7gBAxgNghgZwREAPALiYATZtHIDeAvhIQFATQD2wC6ATgK5TrUMAUAlGZVRAiYAHEJy4BuPlQYh

Jul	AUG	Sep
	21
2020	2021	2022

ast

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