Code snippets

137 snippets

• PHP Tested

  Validate emails and URLs in PHP

  Use filter_var to validate email addresses and http(s) URLs, with an allow-list for schemes.

• JavaScript Tested

  Remove duplicates from an array

  Deduplicate primitives with a Set, or objects by a key or computed value, keeping the first occurrence.

• TypeScript Tested

  Typed Object.keys and Object.entries

  Helpers that keep key types instead of widening to string, for objects you know the shape of.

• TypeScript Tested

  Type-safe event emitter

  An event emitter whose event names and payloads are checked by the compiler through a generic map type.

• JavaScript Tested

  Truncate a string with an ellipsis

  Shorten text to a maximum length without cutting in the middle of a word or a Unicode character.

• PHP Tested

  Truncate multibyte strings safely in PHP

  Shorten UTF-8 text with mb_ functions so accents and emoji are never cut in half.

• SQL

  Top N rows per group

  Get the latest or highest N rows for each category using ROW_NUMBER in a subquery.

• Python Tested

  Token bucket rate limiter

  Allow bursts but cap the sustained request rate with a small thread-safe token bucket.

• Python Tested

  Time a block of code with a context manager

  Measure elapsed wall-clock time of a with-block using time.perf_counter.

• JavaScript Tested

  Sort an array by multiple keys

  Sort objects by one field, then break ties with another, with ascending or descending order per field.

• SQL

  Soft delete with a partial unique index

  Keep deleted rows but still enforce unique emails among active rows using a partial unique index.

• Python Tested

  Slugify a string

  Turn text into a lowercase, hyphenated, ASCII-only slug using only the standard library.