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4 A detailed look at global variables

In this chapter, we take a detailed look at how JavaScript’s global variables work. Several interesting phenomena play a role: the scope of scripts, the so-called global object, and more.

• 4.1 Scopes
• 4.2 Lexical environments
• 4.3 The global object
• 4.4 In browsers, globalThis does not point directly to the global object
• 4.5 The global environment
• 4.6 Conclusion: Why does JavaScript have both normal global variables and the global object?
• 4.7 Further reading and sources of this chapter