检查数组是降序，升序还是未排序?

问题描述

我刚刚开始使用javascript进行编程，我需要练习一些问题以使EXP与代码构建逻辑结合在一起.我收到了有关作业的问题，但由于某种原因，尽管对我来说似乎合乎逻辑"，但我还是无法使它起作用.检查数组是降序，升序还是未使用循环排序.

I'm just beginning with programming using javascript and I need to practice some questions to get EXP with the logic of code build.I got this question for homework but I can't make it work for some reason, even though it seems "logic" to me.Check if an array is descending, ascending or not sorted using loops.

我只是菜鸟，所以请尝试帮助我解决这个问题，因为我只能循环学习(:这是我写的代码:

I'm just a noob so please try and help me figure this out as I only got to loops in my studies (: this is the code I wrote:

        var array = [1, 2, 3, 7 ];
        var d = 0;
        var c =0 ;
        var b = 1;
        var a = 0;
        for (var i = 1; i <= array.length; i++)
            {
                if (array[c]<array[b] && a!== -1  ){
                   d = -1;
                   c =c+1;
                   b = b+1;
                   if(c==array.length){
                    console.log("asc");
                     break;
                   }else{
                     continue;
                }

                } else if (array[c]>array[b] && d!==-1 ){
                           a = -1;
                           d= d+1;
                           b = b+1;
                    if(i=array.length){
                    console.log("dsc");
                    break;
               }else{continue;}

               } else{

                    console.log("unsorted array");
                    break;
                }

            }

推荐答案

检查数组是降序，升序还是未使用循环排序"

"Check if an array is descending, ascending or not sorted using loops"

// define the array
var array = [1,2,3,7];

// keep track of things
var isDescending = true;
var isAscending = true;

// we're looking ahead; loop from the first element to one before the last element
for (var i=0, l=array.length-1; i<l; i++)
{

   ////////////////////////////////////////////////////////////

   // log to the console to show what's happening for each loop iteration

   // this is the ith iteration 
   console.log("loop iteration %s", i);

   // breaking isDescending down:
   // is this value greater than the next value?
   console.log("A: (%s > %s) = %s", array[i], array[i+1], (array[i] > array[i+1]));

   // have all values been descending so far?
   console.log("B: isDescending: %s", isDescending);

   // if this value is greater than the next and all values have been descending so far, isDescending remains true. Otherwise, it's set to false.
  console.log("are A and B both true? %s", (isDescending && (array[i] > array[i+1])));

   // add a line break for clarity
   console.log("");

   ////////////////////////////////////////////////////////////


   // true if this is greater than the next and all other so far have been true
   isDescending = isDescending && (array[i] > array[i+1]);

   // true if this is less than the next and all others so far have been true
   isAscending = isAscending && (array[i] < array[i+1]);

}

if (isAscending)
{
  console.log('Ascending');
}
else if (isDescending) 
{
  console.log('Descending');
}
else
{
  console.log('Not Sorted');
}

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