Code snippets

137 snippets

• PHP Tested

  Hash and verify passwords in PHP

  Store passwords with password_hash and check them with password_verify, including rehash on login.

• JavaScript Tested

  Group an array of objects by a key

  Build an object of arrays keyed by a property or computed value, using Object.groupBy or a reduce fallback.

• JavaScript Tested

  Format relative time ("3 hours ago") with Intl

  Turn a date into a localized relative string using Intl.RelativeTimeFormat, with no library.

• SQL Tested

  Find duplicate rows by one or more columns

  List values that appear more than once with GROUP BY and HAVING, including how many times.

• JavaScript Tested

  fetch with a timeout and error handling

  Abort slow HTTP requests with AbortSignal.timeout and turn non-2xx responses into real errors.

• Bash

  Delete local Git branches that are already merged

  Clean up merged local branches safely, excluding main, master, develop and the current branch.

• SQL Tested

  Delete duplicate rows but keep the newest

  Remove duplicates in PostgreSQL using ROW_NUMBER over a partition, keeping one row per key.

• JavaScript Tested

  Debounce a function

  Delay a function call until the caller has stopped invoking it for a given time, with cancel support.

• CSS

  Dark mode with CSS custom properties and color-scheme

  Switch themes by redefining variables under prefers-color-scheme, with a manual override attribute.

• Python Tested

  Count word frequency in text

  Tokenize text and list the most common words using collections.Counter.

• JavaScript

  Copy text to the clipboard

  Use the async Clipboard API with a legacy fallback and report success or failure to the user.

• Python Tested

  Split any iterable into batches

  Yield fixed-size lists from a list, generator or file without loading everything into memory.