➕optional invocation ?.()

🚧 under construction -> flowchart

• JS ⟩ statement ⟩ expression ⟩ operator ⟩ optional chaining ⟩ optional invocation ?.()

• JS ⟩ value ⟩ object ⟩ property ⟩ access ⟩ optional invocation ?.()

(⭐️ ES2020) (🌟 chaining rules | table of operators )

f?.(args) returns undefined if f is nullish.

🈯 synonyms："conditional invocation", "optional invocation"

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