random-generator_node-red-contrib/nodes/listGenerator.js

A package to meet the randomness generation needs of node-red developers

module.exports = function (RED) {
  function listGenerator(config) {
    RED.nodes.createNode(this, config);
    var node = this;
    node.on("input", function (msg) {
      var data = msg["payload"]["data"];
      function shuffleArray(array) {
        for (var i = array.length - 1; i > 0; i--) {
          var j = Math.floor(Math.random() * (i + 1));
          var temp = array[i];
          array[i] = array[j];
          array[j] = temp;
          return array;
        }
      }
      switch (config.opType) {
        case "rElement":
          msg.payload = data[parseInt(Math.floor(Math.random() * data.length))];
          break;
        case "rList":
          msg.payload = shuffleArray(data);
          break;
      }
      node.send(msg);
    });
  }
  RED.nodes.registerType("List", listGenerator);
};