javascript - 对包含数组的字典进行排序作为值和等级

Question

我正在寻找尽可能最好、最少的操作来解决这个问题。

var sourceDictionary = {
    "200" : [
        [ "a", 5 ],
        [ "al", 6 ],
        [ "xl", 8 ]
    ],
    "201" : [
        [ "b", 2 ],
        [ "al", 16 ],
        [ "al", 26 ],
        [ "al", 9 ],
        [ "al", 3 ]
    ],
    "202" : [
        [ "lm", 7 ]
    ]
}

我想根据每个键中包含的整数值对字典进行排序，然后对每个值进行排序，如 outputputDictionary 所示。

var targetDictionary = {
    "200" : [
        [ "a", 5, "rank-7" ],
        [ "al", 6, "rank-6" ],
        [ "xl", 8, "rank-4" ]
    ],
    "201" : [
        [ "b", 2, "rank-9" ],
        [ "al", 16, , "rank-2" ],
        [ "al", 26, "rank-1" ],
        [ "al", 9, "rank-3" ],
        [ "al", 3, "rank-8" ]
    ],
    "202" : [
        [ "lm", 7, "rank-5" ]
    ]
}

例如 [ "al", 26, "rank-1"] 。这是 rank-1，因为 26 是所有其他值中的最大值。

Javascript是最优选的语言。寻找最好的最优解

Answer 1

由于数组是通过引用传递的，因此您可以像这样使用它:

function rankify(obj) {
  // PHASE 1: get a reference of all the sub-arrays
  var references = [];
  for(var key in obj) {               // for each key in the object obj
    obj[key].forEach(function(e) {    // for each element e (sub-array) of the array obj[key]
      references.push(e);             // push a reference of that array into reference array
    });
  }
  
  // PHASE 2: sort the references
  references.sort(function(a, b) {    // sort the items
    return b[1] - a[1];               // to reverse the sort order (a[1] - b[1])
  });
  
  // PHASE 3: assign the ranks
  references.forEach(function(e, i) { // for each array in the reference array
    e.push("rank-" + (i + 1));        // push another item ("rank-position") where the position is defined by the sort above
  });
}


var sourceDictionary = {"200" : [[ "a", 5 ],[ "al", 6 ],[ "xl", 8 ]],"201" : [[ "b", 2 ],[ "al", 16 ],[ "al", 26 ],[ "al", 9 ],[ "al", 3 ]],"202" : [[ "lm", 7 ]]};

rankify(sourceDictionary);
console.log(sourceDictionary);

如果允许使用箭头函数:

function rankify(obj) {
  Object.keys(obj)
        .reduce((ref, k) => ref.concat(obj[k]), [])    // get the references array
        .sort((a, b) => b[1] - a[1])                   // sort it
        .forEach((e, i) => e.push("rank-" + (i + 1))); // assign the rank
}


var sourceDictionary = {"200" : [[ "a", 5 ],[ "al", 6 ],[ "xl", 8 ]],"201" : [[ "b", 2 ],[ "al", 16 ],[ "al", 26 ],[ "al", 9 ],[ "al", 3 ]],"202" : [[ "lm", 7 ]]};

rankify(sourceDictionary);
console.log(sourceDictionary);