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# AI solution for JavaScript Coding Question on BFE.dev 78. convert HEX color to RGBA

Here's one possible solution in JavaScript:

``function hexToRgb(hex) {  // Remove any leading "#" from the hex code  hex = hex.replace(/^#/, '');  // Validate the input: it should be either 3 or 6 hex digits  if (!/^(?:[0-9a-fA-F]{3}){1,2}\$/.test(hex)) {    throw new Error('Invalid hex code');  }  // Convert a 3-digit hex code to a 6-digit one by duplicating each digit  if (hex.length === 3) {    hex = hex.split('').map(x => x + x).join('');  }  // Convert the hex code to RGB values (as integers)  const r = parseInt(hex.substr(0, 2), 16);  const g = parseInt(hex.substr(2, 2), 16);  const b = parseInt(hex.substr(4, 2), 16);  // Round the alpha value to 2 decimal places (if needed)  const alpha = Math.round((1) * 100) / 100;  // Return the RGB values as a functional notation string  return `rgba(\${r},\${g},\${b},\${alpha})`;}``

Here's how you can use this function:

``console.log(hexToRgb('#fff')); // 'rgba(255,255,255,1)'console.log(hexToRgb('#00aaff')); // 'rgba(0,170,255,1)'console.log(hexToRgb('#123abc')); // 'rgba(18,58,188,1)'console.log(hexToRgb('#abc')); // Error: Invalid hex codeconsole.log(hexToRgb('#abc1234')); // Error: Invalid hex code``