Results for “Ownership & optional values”
Small, practical examples. Search by task or narrow things down below.
Transform a collection into a plain array
jQuery: map followed by get returns ordinary JavaScript values.
jQuery✓ Tested
Transform each value with map
Transform each value with map in a complete Rust program using the standard library.
Rust✓ Tested
Unpack a tuple with structured bindings
C++: Structured bindings give names to the parts of a returned compound value.
C++✓ Tested
Update an atomic counter
Update an atomic counter in a complete Rust program using the standard library.
Rust✓ Tested
Use a fixed-size container with bounds checking
C++: std::array retains its element count and supports checked access through at.
C++✓ Tested
Use a hash map for direct key lookup
C++: unordered_map provides key lookup without promising iteration order.
C++✓ Tested
Use a last-in first-out stack
C++: Read top before pop because pop does not return the removed value.
C++✓ Tested
Write and read typed binary fields
Java: Data streams use a matching write/read order and fixed encodings for Java primitive values.
Java✓ Tested
Animate a numeric CSS property
jQuery: animate interpolates supported numeric properties to their final values.
jQuery✓ Tested
Average a fixed set of readings
Accumulate sample values without overflowing a 16-bit total.
array✓ Tested
Avoid a shared mutable default argument
Python: Create a fresh list inside the function when the optional argument is omitted.
Python✓ Tested
Build a JSON array from rows
Aggregate ordered text values into JSON.
json_group_array✓ Tested