how to in a observable find and move item to top of collection
-1
New to Rxjs. I am familiar with pipe, filter, sort , map etc but not able to get this problem. I need to find an item in my observable returned data and move it to the top before it displays. In this example Darth Vader is item 4 and I want to find and move to 0th or first position in observable array/collection.
https://stackblitz.com/edit/findandmakefirst
angular typescript rxjs observable
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
add a comment |
-1
New to Rxjs. I am familiar with pipe, filter, sort , map etc but not able to get this problem. I need to find an item in my observable returned data and move it to the top before it displays. In this example Darth Vader is item 4 and I want to find and move to 0th or first position in observable array/collection.
https://stackblitz.com/edit/findandmakefirst
angular typescript rxjs observable
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use theanytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.
– JB Nizet
Nov 19 '18 at 21:29
add a comment |
-1
-1
-1
New to Rxjs. I am familiar with pipe, filter, sort , map etc but not able to get this problem. I need to find an item in my observable returned data and move it to the top before it displays. In this example Darth Vader is item 4 and I want to find and move to 0th or first position in observable array/collection.
https://stackblitz.com/edit/findandmakefirst
angular typescript rxjs observable
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
New to Rxjs. I am familiar with pipe, filter, sort , map etc but not able to get this problem. I need to find an item in my observable returned data and move it to the top before it displays. In this example Darth Vader is item 4 and I want to find and move to 0th or first position in observable array/collection.
https://stackblitz.com/edit/findandmakefirst
angular typescript rxjs observable
angular typescript rxjs observable
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
edited Nov 19 '18 at 22:16
georgeawg
33.1k104968
33.1k104968
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
asked Nov 19 '18 at 21:23
GulluGullu
1,43342758
1,43342758
So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use theanytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.
– JB Nizet
Nov 19 '18 at 21:29
add a comment |
So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use theanytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.
– JB Nizet
Nov 19 '18 at 21:29
So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use the
anytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.– JB Nizet
Nov 19 '18 at 21:29
So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use the
anytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.– JB Nizet
Nov 19 '18 at 21:29
add a comment |
2 Answers
2
active
oldest
votes
0
Like this?
people$ = this.http.get('https://swapi.co/api/people/')
.map((res:any) => {
var _vader = res.results.splice(res.results.findIndex(x => x.name === 'Darth Vader'), 1);
return [..._vader, ...res.results];
});
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
add a comment |
1
import { People } from './sw-people.model';
interface Results {
count: Number,
next: String,
previous: string,
results: People,
}
@Injectable()
export class SwPeopleService {
people$ = this.http.get('https://swapi.co/api/people/')
.map((res: Results) => {
return res.results.sort((a: People, b: People) => {
return a.name === "Darth Vader" ? -1 : b.name === "Darth Vader" ? 1 : 0;
});
});
constructor(private http: HttpClient) {}
}
answered Nov 19 '18 at 22:40
amsams
2187
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Like this?
people$ = this.http.get('https://swapi.co/api/people/')
.map((res:any) => {
var _vader = res.results.splice(res.results.findIndex(x => x.name === 'Darth Vader'), 1);
return [..._vader, ...res.results];
});
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
add a comment |
0
Like this?
people$ = this.http.get('https://swapi.co/api/people/')
.map((res:any) => {
var _vader = res.results.splice(res.results.findIndex(x => x.name === 'Darth Vader'), 1);
return [..._vader, ...res.results];
});
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
add a comment |
0
0
0
Like this?
people$ = this.http.get('https://swapi.co/api/people/')
.map((res:any) => {
var _vader = res.results.splice(res.results.findIndex(x => x.name === 'Darth Vader'), 1);
return [..._vader, ...res.results];
});
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
Like this?
people$ = this.http.get('https://swapi.co/api/people/')
.map((res:any) => {
var _vader = res.results.splice(res.results.findIndex(x => x.name === 'Darth Vader'), 1);
return [..._vader, ...res.results];
});
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
answered Nov 19 '18 at 22:29
Sebastian MünsterSebastian Münster
20719
20719
add a comment |
add a comment |
1
import { People } from './sw-people.model';
interface Results {
count: Number,
next: String,
previous: string,
results: People,
}
@Injectable()
export class SwPeopleService {
people$ = this.http.get('https://swapi.co/api/people/')
.map((res: Results) => {
return res.results.sort((a: People, b: People) => {
return a.name === "Darth Vader" ? -1 : b.name === "Darth Vader" ? 1 : 0;
});
});
constructor(private http: HttpClient) {}
}
answered Nov 19 '18 at 22:40
amsams
2187
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
add a comment |
1
import { People } from './sw-people.model';
interface Results {
count: Number,
next: String,
previous: string,
results: People,
}
@Injectable()
export class SwPeopleService {
people$ = this.http.get('https://swapi.co/api/people/')
.map((res: Results) => {
return res.results.sort((a: People, b: People) => {
return a.name === "Darth Vader" ? -1 : b.name === "Darth Vader" ? 1 : 0;
});
});
constructor(private http: HttpClient) {}
}
answered Nov 19 '18 at 22:40
amsams
2187
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
add a comment |
1
1
1
import { People } from './sw-people.model';
interface Results {
count: Number,
next: String,
previous: string,
results: People,
}
@Injectable()
export class SwPeopleService {
people$ = this.http.get('https://swapi.co/api/people/')
.map((res: Results) => {
return res.results.sort((a: People, b: People) => {
return a.name === "Darth Vader" ? -1 : b.name === "Darth Vader" ? 1 : 0;
});
});
constructor(private http: HttpClient) {}
}
answered Nov 19 '18 at 22:40
amsams
2187
import { People } from './sw-people.model';
interface Results {
count: Number,
next: String,
previous: string,
results: People,
}
@Injectable()
export class SwPeopleService {
people$ = this.http.get('https://swapi.co/api/people/')
.map((res: Results) => {
return res.results.sort((a: People, b: People) => {
return a.name === "Darth Vader" ? -1 : b.name === "Darth Vader" ? 1 : 0;
});
});
constructor(private http: HttpClient) {}
}
answered Nov 19 '18 at 22:40
amsams
2187
answered Nov 19 '18 at 22:40
amsams
2187
answered Nov 19 '18 at 22:40
amsams
2187
answered Nov 19 '18 at 22:40
amsams
2187
2187
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
add a comment |
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
Thanks for a more detailed answer.
– Gullu
Nov 20 '18 at 14:22
add a comment |
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So, use the map() operator, and use it to transform the array you receive into an array containing the same elements in the order you want. And please, don't use the
anytype. Define an interface describing the objects you receive. Using proper types will help you understand what you need to do.– JB Nizet
Nov 19 '18 at 21:29