react-native-graph-plus/lib/module/utils/getSixDigitHex.js

📈 Beautiful, high-performance Graphs and Charts for React Native +

export function getSixDigitHex(color) {
  if (!color.startsWith('#')) throw new Error(`react-native-graph: "${color}" is not a valid hex color!`);
  const hexColor = color.substring(1); // removes '#'

  switch (hexColor.length) {
    case 3:
      {
        const sixDigitHex = hexColor.split('').map(hex => hex + hex).join('');
        return `#${sixDigitHex}`;
      }

    case 6:
      return `#${hexColor}`;

    case 8:
      return `#${hexColor.substring(0, 6)}`;

    default:
      throw new Error(`react-native-graph: Cannot convert "${color}" to a six-digit hex color!`);
  }
}
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