some array helpers.

array-extensions.js

Array.prototype.max = function(){
  return this.reduce(function(prev, current){
      if (current > prev){
        prev = current;
      }
      return prev;
  }, 0);
}
 
Array.prototype.min = function(){
  return this.reduce(function(prev, current){
      if (current < prev){
        prev = current;
      }
      return prev;
  }, 0);
}
 
Array.prototype.sum = function(){
  return this.reduce(function(prev, current){
    return prev + current;
  }, 0);
}
 
Array.prototype.average = function(){
  return this.sum() / this.length;
}

util-funcs.js

function max(arr){
  return arr.reduce(function(prev, current){
      if (current > prev){
        prev = current;
      }
      return prev;
  }, 0);
}

function min(arr){
  return arr.reduce(function(prev, current){
      if (current < prev){
        prev = current;
      }
      return prev;
  }, 0);
}

function sum(arr){
  return arr.reduce(function(prev, current){
    return prev + current;
  }, 0);
}

function average(arr){
  return sum(arr) / arr.length;
}