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Small, practical examples. Search by task or narrow things down below.

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PostgresGetting Started

Calculate a total for each group

Postgres: Group nonmissing categories and calculate separate totals.

Postgres✓ Tested
SQLiteGetting Started

Calculate a total for each group

SQLite: Group nonmissing categories and calculate separate totals.

SQLite✓ Tested
C++Numeric parsing & calculations

Calculate a two-dimensional vector length

C++: hypot avoids unnecessary intermediate overflow in the sum of squares.

C++✓ Tested
RustGetting Started

Calculate an order subtotal

Calculate an order subtotal in a complete Rust program using the standard library.

Rust✓ Tested
C++Sequence algorithms

Calculate the dot product of two vectors

C++: inner_product multiplies corresponding elements and accumulates them from a chosen seed.

C++✓ Tested
CSmall algorithms & bit operations

Calculate the greatest common divisor

C: Euclid’s algorithm repeatedly replaces a pair with the divisor and remainder.

C✓ Tested
AngularPipes & formatting

Capitalize words with TitleCasePipe

Capitalize words with TitleCasePipe with a standalone Angular component and explicit browser behavior.

Angular✓ Tested
Bash ScriptsInput streams & redirection

Capture standard output and standard error separately

Bash Scripts: Use distinct redirections when diagnostic text should not be mixed with data.

Bash Scripts✓ Tested
SQL ServerTransactions & tables

Catch a T-SQL error

Handle an expected conversion error in TRY/CATCH.

TRY CATCH✓ Tested
Bash ScriptsProcesses & environment

Change directory only for one operation

Bash Scripts: A subshell makes a temporary directory change without affecting later commands.

Bash Scripts✓ Tested
CSSFlexbox alignment

Change visual order without changing DOM order

CSS: Order changes flex painting positions while keyboard and reading order still follow the document.

CSS✓ Tested
GitGetting Started

Check a change for whitespace problems

Git: Check a change for whitespace problems inside the disposable repository created by the input setup.

Git✓ Tested