I am looking to create distinct alphabetical keys in sequential order using AngularJS

Question

I am looking to create distinct alphabetical keys in sequential order using AngularJS

Is there a way to create keys in alphabetical order that start with

aaaaa

and continue on to aaaab, aaaac, and so forth, properly generating the keys?

This is how I would like my JSON sample to be created:

 var keygen={aaaaa,
             aaaab,
             aaaac .........aaaaz,aaaba ....}

This is my JavaScript code:

$scope.doKeyGen=function(lastValueInJSON)
                {  // Do something 
                   }

javascript angularjs arrays json

Answer 1

Answer №1

Here is a solution that should work for your needs. You can find the implementation on JS Fiddle by clicking here.

It's important to ensure that the final value you provide will be reached, otherwise you risk falling into an infinite loop. Additionally, you have the option to customize the number of characters in the call to getNext(). Just remember to match the initial value and "aaaaa" with the same number of characters as the final value "asxas".

 String.prototype.replaceAt=function(index, replacement) {
        return this.substr(0, index) + replacement+ this.substr(index + replacement.length);
    }

 var json = [];
 function getNext(charCount,lastValue){
    changeIndex = charCount -1;
   var newValue = "";
     while (changeIndex >= 0){
        if(lastValue[changeIndex] !== "z"){
           var changed = lastValue[changeIndex];
           var replacechanged = String.fromCharCode(changed.charCodeAt(0)+1);
           newValue = lastValue.replaceAt(changeIndex,replacechanged)
           for(var j=changeIndex+1; j < charCount; ++j){
              newValue = newValue.replaceAt(j,"a");
           }
           return newValue;
         }
         changeIndex--;
      }
 }

 function createJSON(lastValue){
    if(!json.length){
      //var startPrefix = "aaaaa";
      json.push("aaaaa");
      while(lastValue !== json[json.length-1]){

         json.push(getNext(5,json[json.length-1]));
      }
      console.log(json);
    }
 }

 createJSON("aaabz");

Answer 2

Here is a solution that should work for your needs. You can find the implementation on JS Fiddle by clicking here.

It's important to ensure that the final value you provide will be reached, otherwise you risk falling into an infinite loop. Additionally, you have the option to customize the number of characters in the call to getNext(). Just remember to match the initial value and "aaaaa" with the same number of characters as the final value "asxas".

 String.prototype.replaceAt=function(index, replacement) {
        return this.substr(0, index) + replacement+ this.substr(index + replacement.length);
    }

 var json = [];
 function getNext(charCount,lastValue){
    changeIndex = charCount -1;
   var newValue = "";
     while (changeIndex >= 0){
        if(lastValue[changeIndex] !== "z"){
           var changed = lastValue[changeIndex];
           var replacechanged = String.fromCharCode(changed.charCodeAt(0)+1);
           newValue = lastValue.replaceAt(changeIndex,replacechanged)
           for(var j=changeIndex+1; j < charCount; ++j){
              newValue = newValue.replaceAt(j,"a");
           }
           return newValue;
         }
         changeIndex--;
      }
 }

 function createJSON(lastValue){
    if(!json.length){
      //var startPrefix = "aaaaa";
      json.push("aaaaa");
      while(lastValue !== json[json.length-1]){

         json.push(getNext(5,json[json.length-1]));
      }
      console.log(json);
    }
 }

 createJSON("aaabz");

Answer 3

Answer №2

In order to generate the keys you need, a recursive function must be utilized. I have provided a snippet of code in this fiddle link that will meet your requirements and also create JSON output.

It is important to note that the code assumes lowercase alphabet keys only, with an example length of 3 characters (aaa). You can opt for a length of 4, however, there may be a decrease in performance.

If you modify any initial key in the input within the linked fiddle, such as 'aay', the code will automatically generate all possible subsequent keys (aaz, aba,.....,zzz).

Answer 4

In order to generate the keys you need, a recursive function must be utilized. I have provided a snippet of code in this fiddle link that will meet your requirements and also create JSON output.

It is important to note that the code assumes lowercase alphabet keys only, with an example length of 3 characters (aaa). You can opt for a length of 4, however, there may be a decrease in performance.

If you modify any initial key in the input within the linked fiddle, such as 'aay', the code will automatically generate all possible subsequent keys (aaz, aba,.....,zzz).

Answer 5

Answer №3

Feel free to utilize this:

function findNextKey(previousKeyCode, indexToUpdate)
{
  var characterCodes = [];
  if(indexToUpdate === undefined)
      indexToUpdate = previousKeyCode.length - 1;

  if(indexToUpdate - 1 > -1 && previousKeyCode.charCodeAt(indexToUpdate) == 122)
  {
     previousKeyCode = findNextKey(previousKeyCode, indexToUpdate - 1);
  }

  previousKeyCode.split('').forEach(function(element){characterCodes.push(element.charCodeAt())});
  characterCodes[indexToUpdate] = 97 + (characterCodes[indexToUpdate] - 96) % 26;

  return String.fromCharCode.apply(0, characterCodes);
}

  //-------------------EDIT ( CREATE KEYS USING THIS FUNCTION )------------
function createKeys(initialKey)
{
  var jsonResult = [];
  var nextKeyGenerated = new Array(initialKey.length + 1 ).join('a');
  jsonResult.push(nextKeyGenerated);

  while(nextKeyGenerated !== initialKey)
  {
    jsonResult.push((nextKeyGenerated = findNextKey(nextKeyGenerated)))
  }

  return jsonResult;
}
  //---------------------------Example----------------------------

var startingPoint = 'test';
console.log('Initial Key : '+startingPoint+' | Number of Generated Keys : '+createKeys(startingPoint).length);

Answer 6

Feel free to utilize this:

function findNextKey(previousKeyCode, indexToUpdate)
{
  var characterCodes = [];
  if(indexToUpdate === undefined)
      indexToUpdate = previousKeyCode.length - 1;

  if(indexToUpdate - 1 > -1 && previousKeyCode.charCodeAt(indexToUpdate) == 122)
  {
     previousKeyCode = findNextKey(previousKeyCode, indexToUpdate - 1);
  }

  previousKeyCode.split('').forEach(function(element){characterCodes.push(element.charCodeAt())});
  characterCodes[indexToUpdate] = 97 + (characterCodes[indexToUpdate] - 96) % 26;

  return String.fromCharCode.apply(0, characterCodes);
}

  //-------------------EDIT ( CREATE KEYS USING THIS FUNCTION )------------
function createKeys(initialKey)
{
  var jsonResult = [];
  var nextKeyGenerated = new Array(initialKey.length + 1 ).join('a');
  jsonResult.push(nextKeyGenerated);

  while(nextKeyGenerated !== initialKey)
  {
    jsonResult.push((nextKeyGenerated = findNextKey(nextKeyGenerated)))
  }

  return jsonResult;
}
  //---------------------------Example----------------------------

var startingPoint = 'test';
console.log('Initial Key : '+startingPoint+' | Number of Generated Keys : '+createKeys(startingPoint).length);

I am looking to create distinct alphabetical keys in sequential order using AngularJS

Answer №1

Answer №2

Answer №3

Similar questions

How to style numbers with spaces in angularjs dataTables

Performing addition in Angular 2 with the help of TypeScript

Identifying Repetitions within Parsed JSON Data

The player clicks once and the game is played two times

Tippy.js tooltips are not adapting to CSS styling as expected

Storing a string in a char array using C programming

Switching from file:// to http:// in Angular / Ionic is a necessary step when incorporating external scripts like the Disqus directive into your project

React components are graced with a clear icon that is visible on every element

What is the best way to handle JSON structures within a .NET web service?

The slideUp function is not functioning as expected

enhancing the style of my Express project with CSS and EJS

Leveraging custom properties in HTML elements with JavaScript

Oops! The requested page "/api/auth/[...nextauth]" is missing the necessary "generateStaticParams()" function, thus making it incompatible with the "output: export" configuration

Can you explain the distinct variations between these two approaches for obtaining API data?

What is the method to convert a single object into an array of multiple objects?

Guidelines for showcasing validation summary on an ASP.NET webpage with the help of Javascript

Show graph post form submission using AJAX

Is it possible to incorporate a 3D array within a struct?

Encountering a problem with React router

AngularJS ng-table with collapsible headers using jQuery accordion