When organizing data, the key value pair automatically sorts information according to the specified key

Question

When organizing data, the key value pair automatically sorts information according to the specified key

I have created a key value pair in Angular. The key represents the questionId and the value is the baseQuestion. The baseQuestion value may be null. One issue I am facing is that after insertion, the key value pairs are automatically sorted in ascending order of the keys. However, I would like to maintain the insertion order. If achieving this is not possible with the current implementation, how could we go about achieving it? Here is my code snippet so far:

for (let i = 0; i < this.questions.length; i++){
    let j= this.questions[i]['questionId'];                
    qnKeyValue[j]= (this.questions[i]['baseQuestion'] == undefined ?null : this.questions[i]['baseQuestion']);
}

javascript angular typescript

Answer 1

Answer №1

In Angular, you have the option to utilize the loadash dictionary for managing key-value pairs.

*

import { Dictionary } from 'lodash';
   let dic: Dictionary<number> = {};
   for (let i = 0; i < this.questions.length;i++){
   let j= this.questions[i]['questionId'];      
   dic[j] = (this.questions[i]['baseQuestion'] == undefined ?null : 
   this.questions[i]['baseQuestion']);;
   }

However, it's important to note that since a dictionary functions as a hash table, maintaining insertion order might be a challenge. In such cases, consider using an Ordered Dictionary instead.

Answer 2

In Angular, you have the option to utilize the loadash dictionary for managing key-value pairs.

*

import { Dictionary } from 'lodash';
   let dic: Dictionary<number> = {};
   for (let i = 0; i < this.questions.length;i++){
   let j= this.questions[i]['questionId'];      
   dic[j] = (this.questions[i]['baseQuestion'] == undefined ?null : 
   this.questions[i]['baseQuestion']);;
   }

However, it's important to note that since a dictionary functions as a hash table, maintaining insertion order might be a challenge. In such cases, consider using an Ordered Dictionary instead.

Answer 3

Answer №2

To maintain the insertion order in JavaScript, you can create an OrderedHash by following this function:

function createOrderedHash() {
    var keys = [];
    var values = {};
    return {
        push: function(key, value) {
            if (!values[key]) keys.push(key);
            values[key] = value;
        },
        insert: function(position, key, value) {
            if (!values[key]) {
                keys.splice(position, 0, key);
                values[key] = value;
            }
        },
        getValue: function(key) { return values[key]; },
        size: function() { return keys.length; },
        getKeys: function() { return keys; },
        getValues: function() { return values; }
    };
};

var myOrderedHash = createOrderedHash();

Answer 4

To maintain the insertion order in JavaScript, you can create an OrderedHash by following this function:

function createOrderedHash() {
    var keys = [];
    var values = {};
    return {
        push: function(key, value) {
            if (!values[key]) keys.push(key);
            values[key] = value;
        },
        insert: function(position, key, value) {
            if (!values[key]) {
                keys.splice(position, 0, key);
                values[key] = value;
            }
        },
        getValue: function(key) { return values[key]; },
        size: function() { return keys.length; },
        getKeys: function() { return keys; },
        getValues: function() { return values; }
    };
};

var myOrderedHash = createOrderedHash();

When organizing data, the key value pair automatically sorts information according to the specified key

Answer №1

Answer №2

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