code: function() {
      this.jsonInit({
        "message0": Blockly.Msg.MATH_RANDOM_FLOAT_TITLE_RANDOM,
        "output": "Number",
        "colour": Blockly.Blocks.math.HUE,
        "tooltip": Blockly.Msg.MATH_RANDOM_FLOAT_TOOLTIP,
        "helpUrl": Blockly.Msg.MATH_RANDOM_FLOAT_HELPURL
      });
    }
docs: Block for random fraction between 0 and 1.
  @this Blockly.Block