Convert hex to RGB

Expand #rgb if needed and read the red, green and blue channels.

JavaScript Version 1.0.0 · MIT · .md

function hexToRgb(hex) { return hex.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i, (_, r, g, b) => `#${r}${r}${g}${g}${b}${b}`).substring(1).match(/.{2}/g).map(channel => parseInt(channel, 16)); }

Input & expected output

"#1c6141"

[
  28,
  97,
  65
]

The edge case

"fff"

[
  255,
  255,
  255
]

Know the limits

• Accepts #rgb and #rrggbb with or without #; alpha channels are outside this contract.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Convert Celsius to Fahrenheit — Apply the temperature conversion without rounding the result.
• Convert URL parameters to object — Read a query string into an object; repeated keys become arrays.
• Convert 3 digits color to 6 digits color — Double each digit of a #rgb color.