Angular6 map is not a function

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I am using angular6, when I write following code:

import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
EditDetail(data) : Observable<Test[]> {
    let url = "http://www.example.com/api/getdetails";     
    return this.httpClient.get(url).map((response: Response) => {
    return <Test[]>response.json();
});

I am getting an error like :

this.httpClient.get(...).map is not a function

in browser console.

I have also tried by

import { pipe } from 'rxjs';

And used

return this.httpClient.get(url).pipe(
map((response: Response) => <Test[]>response.json())
  );

But it shows error like

 this.httpClient.get(...).pipe is not a function

Starting from RxJS 5.5 you need to pipe map function.

return this.httpClient.get(url).pipe(
   map((response: Response) => <Test[]>response.json())
);

For more see Pipeable operators.

angular 6 ERROR TypeError: items.map is not a function · Issue , map is not a function it is in ng-select.js file,, while the items is recieved as a string of my typeahed,, but the map is not defined.. and since I am  I am getting this error ERROR TypeError: ERROR TypeError: array.map is not a function error while using this angular pipe and here is the code. export class

You can try with this solution.

this.httpClient.get(...).pipe(
    map(data => res)
).subscribe((data):any=>{
    console.log(data)
}) 

Angular 5: this.http.get().map is not a function · Issue , I'm submitting a [x] Regression (a behavior that used to work and stopped working in a new release) [ ] Bug report [ ] Feature request  I'm submitting a [x] Regression (a behavior that used to work and stopped working in a new release) [ ] Bug report [ ] Feature request [ ] Documentation issue or request [ ] Support request => Please do not submit support request here

use pipe in order to use map. You need to use http client module in order use pipe function. Import this and initialize in constructor

import {HttpClient} from '@angular/common/http';
this.httpClient.get(...).pipe(map(data => res))

Reading the RxJS 6 Sources: Map and Pipe, map wraps the projection function in an observable, and starts emitting string It's not invoked in situations where it is passed only one operator (perhaps for  1. Angular 7.0.0 2. Angular CLI 7.0.3 3. TypeScript 3.1.1 4. Node.js 10.3.0 5. NPM 6.1.0 6. RxJS 6.3.3 Observable and map map is a RxJS pipeable operator. map applies a given function to each element emitted by the source Observable and emits the resulting values as an Observable. map is imported as following.

First, you need to import operator map:

import { map } from 'rxjs/operators';

Second, you can use pipe(map()) like:

return this.httpClient.get(url).pipe(map((response: Response) => {}))

Solving Common Angular 2 HTTP Pitfalls: No map() Method for , The Most Common Problem: map Not A Function. When you make an HTTP request to a JSON endpoint, you map the response text to a JSON  may be there is compatibility issue with rxjs and angular compiler version otherwise there is nothing wrong with syntax of map import. you can try importing like this:

With Angular 6 and rxjs 6.3.1 it works as described above. I also had some problems with this change in rxjs and created a small demo.

imports:

`import { HttpClient, HttpErrorResponse, HttpParams, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs';
import { map, take } from 'rxjs/operators'
`

simple1 function with a httpclient-get. In the map function, some filtering is done. Return value is an observable :

`simple1(): Observable<any> {
    return this.http.get('https://jsonplaceholder.typicode.com/todos').pipe(
      map((res:[any]) => {
        let newArray:[any] = <any>[] ;
        res.forEach( (e) => {
          if( e['title'][0] == 'a') {
              newArray.push( res[0])
          }
        })
        return newArray
      })
    )
  }`

Consume the observable:

`constructor(private http: HttpClient) {
    this.simple1().subscribe(
      (response:HttpResponse<any>) => { console.log(response)},
      (error:HttpErrorResponse) => { console.log("error", error)},
      () => { console.log( 'finish')}
    )
  }`

Complete demo code is here

Map.prototype.forEach(), forEach executes the callback function once for each element in the Map object. It does not return a value. Examples. Printing the contents of a  The map () method creates a new array with the results of calling a provided function on every element in the calling array. var array1 = [1, 4, 9, 16]; // pass a function to map const map1 = array1.map (x => x * 2); console.log (map1); // expected output: Array [2, 8, 18, 32] The source for this interactive example is stored in a GitHub

TypeError: "x" is not a function, For example, JavaScript objects have no map function, but the JavaScript Array object does. There are many built-in functions in need of a (  Guys, you have to add map (install rxjs@5.0.0-alpha.11) import 'rxjs/operators/map'; I don't know if for Http module we will always have to do this. As far as I know map is one of the defaults one. Anyway, with this you can make it work for now until you get an official answer. Note that I had to map it like this

[Angular] TypeError: this.http.post().map is not a function, I am trying to do a post request from ANGULAR > API REST >Blockchain (​hyperledger), using a reactive form with Angular 6, but when clicking  I had the same problem initially. It turned out to be the same issue listed here, which is that the data field you provide to nvd3 is expected to be an array (which has a map method), rather than an object (which does not have a map method).

Transforming Responses Using the Map Operator in Angular , A map operator is a function that builds on the observable's Similar to the well-​known Array.prototype.map function, this operator applies a a single operator, it's not hard to extend that understanding to multiple operators. The map () method creates a new array with the results of calling a function for every array element. The map () method calls the provided function once for each element in an array, in order. Note: map () does not execute the function for array elements without values. Note: this method does not change the original array. Browser Support.

Comments
  • Angular 6 moved to RxJS 6, you need to migrate: github.com/ReactiveX/rxjs/blob/master/docs_app/content/guide/v6/….
  • I am using RXJS version 6
  • I have tried but I am getting an error like : this.httpClient.get(...).pipe is not a function
  • I have also added import { pipe } from 'rxjs'; But it's not working
  • There is something that is not correct in your code. pipe must be visible. Are you using RxJS 5.5 or higher ?
  • I have tried but I am getting an error like : this.httpClient.get(...).pipe is not a function
  • Are you using RXJS version 6 if no then npm install rxjs@6 rxjs-compat@6 --save
  • Yes, I am using RXJS version 6
  • I have tried but I am getting an error like : this.httpClient.get(...).pipe is not a function