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Return the first item with a generic function
Preserve the element type while allowing empty arrays.
generics✓ Tested
Convert ASCII text to uppercase
Convert characters with toupper while avoiding signed-char undefined behavior.
C✓ Tested
Count words using a Map
Update a keyed counter without losing its value type.
Map✓ Tested
Find the first matching array item
JavaScript: find returns undefined when no item satisfies the predicate.
JavaScript✓ Tested
Find the first matching array item
TypeScript: find returns undefined when no item satisfies the predicate.
TypeScript✓ Tested
Give an optional property a default
Handle missing object fields with nullish coalescing.
optional✓ Tested
Read a nested optional value
Avoid dereferencing a missing nested object.
optional chaining✓ Tested