The main problem related to using the ngFor directive with an index is that it can lead to unexpected results when the data being iterated over changes. This is because the index is not automatically updated when items are added or removed from the array, so if a new item is added at index 0, all of the other items will have their indexes shifted down by one. This can lead to incorrect data being displayed in your view or unexpected behavior in your application.
<ul>
<li *ngFor="let item of items; let i = index">{{i}} - {{item}}</li>
</ul>
1. This line of code creates an unordered list.
2. The *ngFor directive is used to loop through the items array and display each item in the list.
3. The let keyword is used to declare a variable called “item” which holds the current item in the iteration of the loop.
4. The let keyword is also used to declare a variable called “i” which holds the index of the current item in the iteration of the loop.
5. This line displays each item in the list with its index number (starting from 0).
What is Angular
Angular is a JavaScript-based open-source front-end web application framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications. The JavaScript components complement Apache Cordova, a framework used for developing cross-platform mobile apps. It aims to simplify both the development and the testing of such applications by providing a framework for client-side model–view–controller (MVC) and model–view–viewmodel (MVVM) architectures, along with components commonly used in rich Internet applications.
ngFor element
NgFor is an Angular structural directive that allows us to loop through data and create a template for each item in an array or object. It is used to repeat a given HTML element a specified number of times. NgFor can be used to display data from an array, object, or string. It can also be used to generate HTML elements based on the values of an array or object. NgFor is typically used in combination with other Angular directives such as ngIf and ngSwitch.
How to get index of ngFor element
You can use the index keyword to get the index of an element in an ngFor loop. The syntax for this is as follows:
In this example, the “i” variable will contain the current index of the loop. You can then use this variable to access or modify elements in your list.
