I'm seeking assistance on how to duplicate an object into another object using Angular 2.
Previously in Angular, I utilized angular.copy() to duplicate objects to the vague reference of the original ones. However, when attempting the same in Angular 2, I encountered the following error:
Error: angular is not defined.
Solution
Angular2 was built using cutting-edge technologies such as TypeScript and ES6.
To create a copy of an object, you can simply use
let copy = Object.assign({}, myObject)Check out some cool examples of using Object assign.
For nested objects:
let copy = JSON.parse(JSON.stringify(myObject))let duplicate = Object.assign({}, originalObject). like previously stated
however, this method is not suitable for nested objects. Therefore, another option could be
let duplicate = JSON.parse(JSON.stringify(originalObject))
To efficiently create deep copies of objects containing nested objects, it is recommended to utilize lodash's cloneDeep method.
When working with Angular, the process can be accomplished in the following manner:
Begin by installing lodash using either yarn add lodash or npm install lodash.
Within your component, import the cloneDeep function and apply it as follows:
import * as cloneDeep from 'lodash/cloneDeep';
...
clonedObject = cloneDeep(originalObject);
Despite adding just 18kb to your project's build, the advantages are certainly worth it.
For further insights on the significance of utilizing lodash's cloneDeep, you can refer to my detailed article here.
One of the ways to achieve this in Angular using ECMAScript6 is by utilizing the spread operator like so:
const clonedObject = {...originalObject};
const course = {
name: 'Angular',
};
const updatedCourse= Object.assign({}, course);
updatedCourse.name= 'React';
console.log(course.name); // displays Angular
console.log(updatedCourse.name); // displays React
To deeply clone nested objects, third-party libraries like lodash can be used. To deep copy using lodash, utilize _.cloneDeep()
const updatedCourse= _.cloneDeep(course);
Give this a go.
Duplicate an Array :
const copiedArr = Object.assign([], originalArr);
Replicate an object :
const copiedObj = Object.assign({}, originalObj);
Loadsh serves as the go-to standard library for performing deep copies of any object. Its recursive nature ensures that every aspect is thoroughly inspected and copied as needed. Developing such an algorithm from scratch can be time-consuming, which is why it's recommended to utilize Loadsh for this purpose.
Object.assign is limited to copying single levels of object references.
To copy objects at any depth, you can use the following method:
let obj1 = {'key1':'value1','nestedObj':{'nestedKey':'nestedValue'}};
let obj2 = JSON.parse(JSON.stringify(obj1));
If you prefer using a library for this task, consider using loadash.js.
A new way to perform a deep copy is now available without the need for any external libraries. See the code snippet below:
const originalObject = {'x':'x', 'y':{'z':'z'}};
const copiedObject = deepClone(originalObject);
Big thanks to Saif for his helpful tip from earlier. Finally got my code working smoothly after struggling with it for three whole days.
this.sElectionFinal.subscribe((election) => {
const electionCopy = Object.assign({}, election)
this.electionsFinal.push(electionCopy)})
SCENARIO: It appears that there might be an error in my Mongoose Model or in the parameters being passed to the route. As a newcomer to the angular2 architecture, I may have overlooked something obvious. ISSUE: ISSUE: ValidationError: CastError: Cas ...
Currently, I'm facing an issue with a button that is not opening to a new site despite following what seems like simple steps. <button mat-raised-button href="https://www.google.com/" color="primary">Connect with Stripe</button> I even a ...
Currently, I am encountering a Typescript Type error when attempting to add a custom new property called 'tab' inside 'Typography' in my Material UI Theme. The error message states: Property 'tab' does not exist on type &apos ...
We maintain all of our Javascript related SDKs in a monorepo at Sentry. https://github.com/getsentry/sentry-javascript If you decide to clone this repository, make sure to properly set it up by running yarn install and then navigate to any file such as p ...
ERROR: 'NG0303: Can't bind to 'ngbTooltip' since it isn't a known property of 'button'.' Encountering this issue in my Angular 12 project when running local tests, the ngbTooltip error is present in all .spec files. ...
While the main app runs smoothly, attempting to serve the bundled SSR results in perplexing errors that I'm struggling to comprehend. All setup details are provided below for reference. The process of creating a server-side app seems riddled with sma ...
My query can be best elucidated with the following code snippet. The comments within the code aim to provide clarity on the nature of the question. type MediaFormats = "video" | "audio"; type IMediaContent<TType extends MediaFormats, TValue> = { ...
Within my application, I have implemented a custom DateAdapter using dayJs. Here is how the module providing it is defined: @NgModule({ providers: [ { provide: MAT_DATE_FORMATS, useValue: MAT_DAYJS_DATE_FORMATS }, { provide: DateAdapter, useClas ...
I'm currently utilizing ngx-translate. Can you tell me if the translation pipe is considered pure or impure? Also, would it be more beneficial to use the directive syntax translate="X" instead? ...
I am in the process of transitioning my AngularJS application to Angular 6, and I'm encountering difficulties converting a JSON object into a TypeScript object list. In my Angular 6 application, I utilize this.http.get(Url) to retrieve data from an AP ...
I'm currently working on retrieving the precise time a document is generated. To achieve this task, I have included the following imports: import { Firebase } from '@ionic-native/firebase/ngx'; import { AngularFirestore } from '@angul ...
Even though I've taken the time to read all of the documentation at https://github.com/material-components/material-web/blob/main/docs/quick-start.md, I'm still struggling to figure out how to incorporate this into my Angular 17 project. I went ...
As a beginner with Angular 4, I am working on creating a bootstrap table with nested components. The child component is supposed to display in a single row, but the table is not rendering correctly. Please refer to the image below for a snapshot: snapshot ...
I am trying to retrieve data from the current user, specifically their company named "ZeroMax", and then store this data in a global variable. The purpose of this variable is to define the path for Firebase. I believe my code gives a clear understanding of ...
Our web platform utilizes Angular JS for the front-end and node js for the backend, creating dynamic pages. When inspecting the code by viewing the source, it appears like this: For our business to succeed, our website needs to be SEO-friendly in order to ...
My setup includes a router configuration like this: router.get('/top-5-cheap', aliasTopTours, getAllTours); I've also implemented some middlewares: Middleware aliasTopTours: In this middleware, I am setting certain properties on the reque ...
What causes func1 to behave as expected while func2 results in an error? type AnyObj = Record<string, any>; type Data = { a: number; b: string }; type DataFunction = (arg: AnyObj) => any; const func1: DataFunction = () => {}; const arg1: Data ...
I am encountering an issue with a callback function in my Typescript project. The problem arises when I try to implement the same functionality in a Node project using Typescript. It seems that when referencing 'this' in Node, it no longer points ...
I am currently working with the following context: interface AlertContextProps { show: (message: string, duration: number) => void; } export const AlertContext = createContext<AlertContextProps>({ show: (message: string, duration: number) =&g ...
Working on my login page with angular and typescript. Clicking the submit button should trigger the login function in the controller, but if the form is invalid, it should just return. New to typescript, I keep running into an error when trying to add an ...