@samscodz/randhexcolor/index.js

A package that generates random hex color. Packed with hex to RGB and hex to CMYK converter.

var randomNum = (max) => Math.floor(Math.random() * max)

function randomhex(length) {
    var result           = '';
    var characters       = '123456789ABCDEF';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
      result += characters.charAt(randomNum(charactersLength));
   }
   return result;
}

function hexToRgb(hex) {
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result ? {
    r: parseInt(result[1], 16),
    g: parseInt(result[2], 16),
    b: parseInt(result[3], 16)
  } : null;
}

let hexToCMYK = (hex) => {
 var computedC = 0;
 var computedM = 0;
 var computedY = 0;
 var computedK = 0;

 hex = (hex.charAt(0)=="#") ? hex.substring(1,7) : hex;

 if (hex.length != 6) {
  alert ('Invalid length of the input hex value!');   
  return; 
 }
 if (/[0-9a-f]{6}/i.test(hex) != true) {
  alert ('Invalid digits in the input hex value!');
  return; 
 }

 var r = parseInt(hex.substring(0,2),16); 
 var g = parseInt(hex.substring(2,4),16); 
 var b = parseInt(hex.substring(4,6),16); 

 // BLACK
 if (r==0 && g==0 && b==0) {
  computedK = 1;
  return [0,0,0,1];
 }

 computedC = 1 - (r/255);
 computedM = 1 - (g/255);
 computedY = 1 - (b/255);

 var minCMY = Math.min(computedC,Math.min(computedM,computedY));

 computedC = (computedC - minCMY) / (1 - minCMY) ;
 computedM = (computedM - minCMY) / (1 - minCMY) ;
 computedY = (computedY - minCMY) / (1 - minCMY) ;
 computedK = minCMY;

 return [computedC,computedM,computedY,computedK];
}

let random = (thing) => {
  var hex = randomhex(6)
  var rgb = hexToRgb(hex)
  var cmyk = hexToCMYK(hex)
  var c = (cmyk[0] / 1) * 100
  var m = (cmyk[1] / 1) * 100
  var y = (cmyk[2] / 1) * 100
  var k = (cmyk[3] / 1) * 100

  if (thing === "hex") {
    return `#${hex}`
  } else if (thing === "rgb") {
    return rgb
  } else if (thing === "cmyk") {
    return cmyk
  } else {
    var data = {
    hex: `#${hex}`,
    rgb: `rgb(${rgb.r}, ${rgb.g}, ${rgb.b})`,
    cmyk: `cmyk(${c}%, ${m}%, ${y}%, ${k}%)`
  }
  return data
  }
}

module.exports = random