Code snippets

137 snippets

• Python Tested

  Read typed settings from environment variables

  Load configuration from the environment with defaults, type conversion and clear errors for missing values.

• JavaScript Tested

  Conditional GET with ETag and 304

  Compute a strong ETag for a response body and answer If-None-Match with 304 Not Modified to save bandwidth.

• JavaScript Tested

  Compose and pipe functions

  Chain single-argument functions left-to-right with pipe, or right-to-left with compose.

• Bash

  Clean up temporary files with trap

  Create a temp directory and guarantee it is removed when the script exits, fails or is interrupted.

• JavaScript Tested

  Clamp, lerp and map a number range

  Small numeric helpers for sliders, animations and progress bars.

• Bash

  Check that required commands are installed

  Fail early with a helpful message when a script depends on tools that are missing.

• CSS

  Center anything with grid

  Center an element horizontally and vertically using two lines of CSS.

• JavaScript Tested

  Capitalize and title-case strings

  Uppercase the first letter of a string or of every word, leaving the rest of each word untouched.

• CSS

  Accessible button styles with states

  A base button with hover, active, disabled and focus styles that meets minimum target size.

• TypeScript Tested

  Branded types for IDs

  Prevent mixing up UserId and OrderId strings by giving each a unique compile-time brand.

• SQL

  Automatically maintain an updated_at column

  A reusable PostgreSQL trigger function that sets updated_at to now() on every UPDATE.

• Python Tested

  Write a file atomically

  Write to a temporary file and rename it into place so readers never see a half-written file.