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// Assign random color
stringToColour(str: string) {
  var hash = 0;
  for (var i = 0; i < str.length; i++) {
      hash = str.charCodeAt(i) + ((hash << 5) - hash);
  }
  var colour = '#';
  for (var i = 0; i < 3; i++) {
      var value = (hash >> (i * 8)) & 0xFF;
      colour += ('00' + value.toString(16)).substr(-2);
  }
  return colour;
}

console.log( stringToColour('hello') );