JS arithmetic group average, maximum, minimum, deviation, standard deviation, median, array from small to large sort, up four, next four

The array to be counted is named data

 var sum = function  (x, y) {return x+y;};　　 sum function var square  = function  (x) {return x*x;};  Each element in the array asks for its square var data  = [1 , 1 , 3 , 5 , 5 ]; var mean  = data.reduce (sum)/data.length;var Deviations  = Data.map (function  (x) {return x mean;}); var StdDev  = math.sqrt (Deviations.map (square). reduce (sum)/(Data.length-1   = Math.max.apply (Null,data) var Min  = Math.min.apply (null,data)  

 var compare = function (x, y) {//Comparison function 
 if (x < y) {
 return-1; 
    } else if (x > Y) {
 return 1; 
    } else {
 return 0; 
 } 
}; 
 var mid;//median 
 Data.sort (compare);//Array sort 
 if (data.length%2==0) {
 Mid = (data[data.length/2]+data[ DATA.LENGTH/2+1])/2 
} 
 if (data.length%2!=0) {
 mid = data[(data.length+1)/2] 
} 

Console.log (" average value:" +mean);
Console.log (" deviation:" +deviations);
Console.log (" standard deviation:" +stddev);
Console.log (" maximum value:" +max);
Console.log (" Minimum Value:" +min);
Console.log ("median:" +mid);
Console.log ("top four min.:" +DATA[DATA.LENGTH/4]);
Console.log ("The next four cents:" +data[data.length/4*3]);

JS arithmetic group mean, maximum, minimum, deviation, standard deviation, median, array from small to large, top four, next four