undefined
🚧 under construction
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🚧 under construction
Last updated
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⟩ ⟩ ⟩ undefined
⟩ ⟩ ⟩ ⟩ ⟩ undefined
( read-only global object property ) automatically assigned to
undefined
is not a keyword
is not a literal
is an immutable & read-only property of the global object
JS doesn't throw any errors if you declare it in the global scope.
has no primitive wrapper, can't call methods, has no properties.
with a function in block (FiB)
sloppy mode: ✅ / initialized to undefined (in outer scope)
strict mode: ⛔ (invisible in outer scope)