text: 
  exports.min = function min (array) {
    if (!array || array.length <= 0) {
      return 0;
    }
    array.sort((a,b) => a - b);
    return array[0];
  }
  
  exports.max = function max (array) {
    if (!array || array.length <= 0) {
      return 0;
    }
    array.sort((a,b) => a - b);
    return array[array.length - 1];
  }
  
  exports.avg = function avg (array) {
    if (!array || array.length <= 0) {
      return 0;
    }
    let sum = 0;
    for (let i = 0; i < array.length; i++ ) {
      sum += array[i];
    }
    return sum / array.length;
  }
  