random-hex-color-generator/index.js

Random hex color generator

const { validateHexColor, generateStaticString, generateRandomNumber } = require("./utils");

// Generate random hex color
function randomHexColor() {
  return "#" + ((Math.random() * 0xffffff) << 0).toString(16).padStart(6, "0").toUpperCase();
}

// Generate random hex color start with custom hex code
function randomHexColorStartWith(start) {
  if (start) {
    const staticLength = start.length;
    const padLength = 6 - staticLength;
    let staticString = "";
    for (let i = 0; i < padLength; i++) {
      staticString = staticString + "F";
    }

    const hexColor =
      "#" + start + ((Math.random() * `0x${staticString}`) << 0).toString(16).padStart(padLength, "0").toUpperCase();
    return validateHexColor(hexColor) ? hexColor : randomHexColor();
  } else {
    return "#FF" + ((Math.random() * 0xffff) << 0).toString(16).padStart(4, "0").toUpperCase();
  }
}

// Generate random hex color end with custom hex code
function randomHexColorEndWith(end) {
  if (end) {
    const staticLength = end.length;
    const padLength = 6 - staticLength;

    let staticString = "";
    for (let i = 0; i < padLength; i++) {
      staticString = staticString + "F";
    }
    const hexColor = (
      "#" +
      ((Math.random() * `0x${staticString}`) << 0).toString(16).padStart(padLength, "0") +
      end
    ).toUpperCase();
    return validateHexColor(hexColor) ? hexColor : randomHexColor();
  } else {
    return "#" + ((Math.random() * 0xffff) << 0).toString(16).padStart(4, "0") + "DD".toUpperCase();
  }
}

// Generate random hex color start and end with
function randomHexColorStartAndEndWith(start, end) {
  if (start && end) {
    const staticStartLength = start.length;
    const staticEndLength = end.length;

    if (staticStartLength + staticEndLength < 6) {
      const padLength = 6 - (staticStartLength + staticEndLength);

      const staticString = generateStaticString(padLength);
      const hexColor = (
        "#" +
        start +
        ((Math.random() * `0x${staticString}`) << 0).toString(16).padStart(padLength, "0") +
        end
      ).toUpperCase();
      return validateHexColor(hexColor) ? hexColor : randomHexColor();
    } else {
      return randomHexColorStartWith(start);
    }
  }
  if (start) {
    return randomHexColorStartWith(start);
  } else {
    return randomHexColorEndWith(end);
  }
}

// Generate random hex color with array
function randomHexColorWithArray(count) {
  const arrayLength = count ? count : generateRandomNumber();
  const randomArray = [];
  for (let x = 0; x < arrayLength; x++) {
    const hexColor = randomHexColor();
    randomArray.push(hexColor);
  }
  return randomArray;
}

// Generate random hex color with array of object
function randomHexColorWithArrayOfObject(count) {
  const arrayLength = count ? count : generateRandomNumber();
  const randomArray = [];
  for (let x = 0; x < arrayLength; x++) {
    const hexColor = randomHexColor();
    randomArray.push({ key: x, value: hexColor });
  }
  return randomArray;
}

// Generate random hex color with array
function randomHexColorArrayStartWith(start, count) {
  if (start) {
    const arrayLength = count ? count : generateRandomNumber();
    const randomArray = [];
    for (let x = 0; x < arrayLength; x++) {
      const hexColor = randomHexColorStartWith(start);
      randomArray.push(hexColor);
    }
    return randomArray;
  } else {
    return randomHexColorWithArray();
  }
}

// Generate random hex color with array
function randomHexColorArrayEndWith(end, count) {
  if (end) {
    const arrayLength = count ? count : generateRandomNumber();
    const randomArray = [];
    for (let x = 0; x < arrayLength; x++) {
      const hexColor = randomHexColorEndWith(end);
      randomArray.push(hexColor);
    }
    return randomArray;
  } else {
    return randomHexColorWithArray();
  }
}

module.exports = {
  randomHexColor,
  randomHexColorStartWith,
  randomHexColorEndWith,
  randomHexColorStartAndEndWith,
  randomHexColorWithArray,
  randomHexColorWithArrayOfObject,
  randomHexColorArrayStartWith,
  randomHexColorArrayEndWith,
};