使用javascript数组调整和删除数字间隙

Question

我试图求助,然后删除sortOrder此JavaScript数组中属性的数字中的任何间隙.

例如:

p[0].sortOrder = 2; 
p[1].sortOrder = 12;
p[2].sortOrder = 4;
p[3].sortOrder = 8;
p[4].sortOrder = 6; 
p[5].sortOrder = 2; 
p[6].sortOrder = 8;   

应该输出到:

p[0].sortOrder = 1; //used to be 2
p[1].sortOrder = 5; //used to be 12
p[2].sortOrder = 2; //used to be 4
p[3].sortOrder = 4; //used to be 8
p[4].sortOrder = 3; //used to be 6 
p[5].sortOrder = 1; //used to be 2
p[6].sortOrder = 4; //used to be 8   

这是它应该运行的功能.我不能围绕消除数字中的空白.

function restackSortOrder(p) {

    //Remove any gaps in numbers here while still retaining any duplicate numbers (which should stay grouped together).

    return p;
}

Answer 1

这是一个解决方案,在评论中有解释:

function resortStackorder(p) {
  var match = p.map(function(e) {                   //create array of sortOrder values
                return e.sortOrder;
              })
               .sort(function(a, b) {return a - b}) //sort the array numerically
               .filter(function(e, idx, array) {    //filter out duplicates
                 return e !== array[idx - 1];
               });

  p.forEach(function(e) {  //look up sortOrder's position in the match array
    e.sortOrder = match.indexOf(e.sortOrder) + 1;
  });
} //resortStackorder

var p = [
  {sortOrder: 2},
  {sortOrder: 12},
  {sortOrder: 4},
  {sortOrder: 8},
  {sortOrder: 6},
  {sortOrder: 2},
  {sortOrder: 8}
];

resortStackorder(p);

console.log(JSON.stringify(p));