Results for “fold”
Small, practical examples. Search by task or narrow things down below.
Update an explicitly mutable variable
Update an explicitly mutable variable in a complete Rust program using the standard library.
Rust✓ Tested
Update one row using its primary key
SQLite: Use a precise WHERE condition to change only the intended row in a scratch table.
SQLite✓ Tested
Update rows selected by a related table
SQLite: Use EXISTS to limit updates based on an independent eligibility table.
SQLite✓ Tested
Update several classifications in one statement
SQLite: A CASE expression computes the new value for each row covered by the update predicate.
SQLite✓ Tested
Use a condition-only for loop
Use a condition-only for loop using a complete Go program with explicit sample inputs.
Go✓ Tested
Use a counted Bash loop
Bash Scripts: Use a counted Bash loop with a small standalone Bash program.
Bash Scripts✓ Tested
Use a default value for an unset variable
Supply a fallback without changing the original variable.
parameter expansion✓ Tested
Use a fallback for an unset variable
Bash Scripts: Use a fallback for an unset variable with a small standalone Bash program.
Bash Scripts✓ Tested
Use a function’s exit status as a boolean result
Bash Scripts: Return zero for success and test the function directly in a conditional.
Bash Scripts✓ Tested
Use a nonnegative remainder for cyclic indexing
Use a nonnegative remainder for cyclic indexing in a complete Rust program using the standard library.
Rust✓ Tested
Use a recursive function for a bounded calculation
Bash Scripts: A recursive factorial demonstrates local variables and a clear base case.
Bash Scripts✓ Tested
Use an alternate value only when a variable is nonempty
Bash Scripts: The colon-plus expansion returns its word only when the parameter has a nonempty value.
Bash Scripts✓ Tested