Shuffling Numbers in an Array After Removing an Element with AngularJS

Question

Shuffling Numbers in an Array After Removing an Element with AngularJS

I am working with a JSON array that contains tasks:

tasks = [{taskcode:1, taskName:'abc'},
       {taskcode:2, taskName:'abc1'},
       {taskcode:3, taskName:'abc2'},
           .....
      ];

If I delete a task with the name abc, I want the task codes of other tasks to be reindexed like this:

tasks = [{taskcode:1, taskName:'abc1'},
       {taskcode:2, taskName:'abc2'},
           .....
      ];

These tasks are added dynamically by pushing values from a popup.

Can anyone help me figure out how to achieve this?

javascript arrays angularjs

Answer 1

Answer №1

Instead of constantly updating the taskCode, you can rely on its position in the array to determine its value whenever needed. This way, there is no need for frequent updates. For instance, when accessing a specific object, you already know its location in the array and can simply add one to get the desired result.

In essence, your property can be represented as index + 1. If you are showcasing the task codes using an ng-repeat, this approach will suffice.

<div ng-repeat="task in tasks">
    <p>Task Code: {{$index + 1}}</p>
    <p>Task Name: {{task.taskName}}</p>
</div>

If you require enumerating these taskCodes prior to any additional operations, it is advisable to execute a single loop for efficiency. By doing so, unnecessary re-indexing of the array after each small operation can be avoided. Instead, re-indexing can occur only when absolutely necessary.

$scope.enumerateTaskCodes = function() {
    $scope.tasks.forEach(function (task, index) {
         task.taskCode = index + 1;
    };
};

Answer 2

Instead of constantly updating the taskCode, you can rely on its position in the array to determine its value whenever needed. This way, there is no need for frequent updates. For instance, when accessing a specific object, you already know its location in the array and can simply add one to get the desired result.

In essence, your property can be represented as index + 1. If you are showcasing the task codes using an ng-repeat, this approach will suffice.

<div ng-repeat="task in tasks">
    <p>Task Code: {{$index + 1}}</p>
    <p>Task Name: {{task.taskName}}</p>
</div>

If you require enumerating these taskCodes prior to any additional operations, it is advisable to execute a single loop for efficiency. By doing so, unnecessary re-indexing of the array after each small operation can be avoided. Instead, re-indexing can occur only when absolutely necessary.

$scope.enumerateTaskCodes = function() {
    $scope.tasks.forEach(function (task, index) {
         task.taskCode = index + 1;
    };
};

Shuffling Numbers in an Array After Removing an Element with AngularJS

Answer №1

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