为什么我的对象键值对被覆盖而不是创建新的键值对？

Question

I am trying to create an object of objects within an object with dynamically created key,value pairs, but the nested object keeps overriding the key value pair instead of creating a new key value pair.

ObjectIDWithQuestions = {};
var ArrayOfBlocks1 = [
  {
    ID: "block1",
    block: "block1",
    BlockElements: [
      { QuestionID: "1"  },
      { QuestionID: "2"  }
    ]
  },
  {
    ID: "block2",
    block: "block2",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
  },
  {
    ID: "block3",
    block: "block3",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
      }
];

for(i=0;i<ArrayOfBlocks1.length;i++){
    for(k=0;k<ArrayOfBlocks1[i].BlockElements.length;k++){
        var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
        ObjectIDWithQuestions[ArrayOfBlocks2]={}
        ObjectIDWithQuestions[""+ArrayOfBlocks2]["questions"+ k]=ArrayOfBlocks1[i].BlockElements[k].QuestionID

    }
}
console.log(ObjectIDWithQuestions);

The expected result of the code is to create an object that is an object of objects that has a two dynamically created key, value pairs instead of one key, value pair that is being overridden.for example, the following code prints:

block1: {questions1: "2"}
block2: {questions1: "2"}
block3: {questions1: "2"}

When it should print

block1: {questions0: "1",questions1:"2"}
block2: {questions0: "1",questions1:"2"}
block3: {questions0: "1",questions1:"2"}

Answer 1

You should initialize

var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
ObjectIDWithQuestions[ArrayOfBlocks2]={}

outside the inner loop. Otherwise it will create an object every time the inner loop iterates

 ObjectIDWithQuestions = {}; var ArrayOfBlocks1 = [ { ID: "block1", block: "block1", BlockElements: [ { QuestionID: "1" }, { QuestionID: "2" } ] }, { ID: "block2", block: "block2", BlockElements: [ { QuestionID: "1" }, { QuestionID: "2" } ] }, { ID: "block3", block: "block3", BlockElements: [ { QuestionID: "1" }, { QuestionID: "2" } ] } ]; for(i=0;i<ArrayOfBlocks1.length;i++){ var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID ObjectIDWithQuestions[ArrayOfBlocks2]={} for(k=0;k<ArrayOfBlocks1[i].BlockElements.length;k++){ ObjectIDWithQuestions[""+ArrayOfBlocks2]["questions"+ k]=ArrayOfBlocks1[i].BlockElements[k].QuestionID } } console.log(ObjectIDWithQuestions); 

Answer 2

Remove these two lines from inner loop and move it to outside of the inner loop,

ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
ObjectIDWithQuestions[ArrayOfBlocks2] = {}

This should do the trick