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Type Program[] is not assignable to string[]

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0

I have the class below. What I'd like to do is filter for the active programs and inactive programs and then get the program names, as an array of strings, for those programs.

Here is the Program class:

export class Program 
 ID: number;
 ProgramDescription: string;
 ProgramName: string;
 ProgramStatus: string;
 FiscalYear: string;
 SupervisorID: string;
 DBN: string;
 IsActive: string;

Here are the methods I wrote in the service:

getPrograms(): Observable<Program[]> 
return this.httpClient.get<Program[]>(environment.apiBaseURL + 'api/Program')
 .pipe(
 map(data => data)
 );


getActivePrograms(): Observable<Program[]> 
return this.getPrograms()
 .pipe(
 map(data => data.filter(program => program.IsActive === 'Y'))
 );


getActiveProgramNames(): Observable<string[]> 
return this.getActivePrograms()
 .pipe(
 map(data => data.filter(program => program.ProgramName.toString())
 );

In getActiveProgramNames(), I'm getting the following error:

Type Program[] is not assignable to type string[]

angular typescript angular6

share|improve this question

edited Mar 24 at 20:46

rds80

asked Mar 24 at 20:42

rds80rds80

1469

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I want to cast all of the ProgramNames to an array of string.
  
  – rds80
  Mar 24 at 20:45
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  filter isn't going to do that for you. map can.
  
  – R. Richards
  Mar 24 at 20:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think @R.Richards is right and you should replace the filter with a map as filter returns a collection of the same type: Program[].
  
  – adz5A
  Mar 24 at 20:46
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this the right code to do that: map(data => data.map(program => program.ProgramName.toString()))
  
  – rds80
  Mar 24 at 20:50
  

  
  
  
  

add a comment | 

0

I have the class below. What I'd like to do is filter for the active programs and inactive programs and then get the program names, as an array of strings, for those programs.

Here is the Program class:

export class Program 
 ID: number;
 ProgramDescription: string;
 ProgramName: string;
 ProgramStatus: string;
 FiscalYear: string;
 SupervisorID: string;
 DBN: string;
 IsActive: string;

Here are the methods I wrote in the service:

getPrograms(): Observable<Program[]> 
return this.httpClient.get<Program[]>(environment.apiBaseURL + 'api/Program')
 .pipe(
 map(data => data)
 );


getActivePrograms(): Observable<Program[]> 
return this.getPrograms()
 .pipe(
 map(data => data.filter(program => program.IsActive === 'Y'))
 );


getActiveProgramNames(): Observable<string[]> 
return this.getActivePrograms()
 .pipe(
 map(data => data.filter(program => program.ProgramName.toString())
 );

In getActiveProgramNames(), I'm getting the following error:

Type Program[] is not assignable to type string[]

angular typescript angular6

share|improve this question

edited Mar 24 at 20:46

rds80

asked Mar 24 at 20:42

rds80rds80

1469

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I want to cast all of the ProgramNames to an array of string.
  
  – rds80
  Mar 24 at 20:45
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  filter isn't going to do that for you. map can.
  
  – R. Richards
  Mar 24 at 20:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think @R.Richards is right and you should replace the filter with a map as filter returns a collection of the same type: Program[].
  
  – adz5A
  Mar 24 at 20:46
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this the right code to do that: map(data => data.map(program => program.ProgramName.toString()))
  
  – rds80
  Mar 24 at 20:50
  

  
  
  
  

add a comment | 

I have the class below. What I'd like to do is filter for the active programs and inactive programs and then get the program names, as an array of strings, for those programs.

Here is the Program class:

export class Program 
 ID: number;
 ProgramDescription: string;
 ProgramName: string;
 ProgramStatus: string;
 FiscalYear: string;
 SupervisorID: string;
 DBN: string;
 IsActive: string;

Here are the methods I wrote in the service:

getPrograms(): Observable<Program[]> 
return this.httpClient.get<Program[]>(environment.apiBaseURL + 'api/Program')
 .pipe(
 map(data => data)
 );


getActivePrograms(): Observable<Program[]> 
return this.getPrograms()
 .pipe(
 map(data => data.filter(program => program.IsActive === 'Y'))
 );


getActiveProgramNames(): Observable<string[]> 
return this.getActivePrograms()
 .pipe(
 map(data => data.filter(program => program.ProgramName.toString())
 );

In getActiveProgramNames(), I'm getting the following error:

Type Program[] is not assignable to type string[]

angular typescript angular6

share|improve this question

edited Mar 24 at 20:46

rds80

asked Mar 24 at 20:42

rds80rds80

1469

export class Program 
 ID: number;
 ProgramDescription: string;
 ProgramName: string;
 ProgramStatus: string;
 FiscalYear: string;
 SupervisorID: string;
 DBN: string;
 IsActive: string;

getPrograms(): Observable<Program[]> 
return this.httpClient.get<Program[]>(environment.apiBaseURL + 'api/Program')
 .pipe(
 map(data => data)
 );


getActivePrograms(): Observable<Program[]> 
return this.getPrograms()
 .pipe(
 map(data => data.filter(program => program.IsActive === 'Y'))
 );


getActiveProgramNames(): Observable<string[]> 
return this.getActivePrograms()
 .pipe(
 map(data => data.filter(program => program.ProgramName.toString())
 );

Type Program[] is not assignable to type string[]

angular typescript angular6

angular typescript angular6

share|improve this question

edited Mar 24 at 20:46

rds80

asked Mar 24 at 20:42

rds80rds80

1469

share|improve this question

edited Mar 24 at 20:46

rds80

asked Mar 24 at 20:42

rds80rds80

1469

asked Mar 24 at 20:42

rds80rds80

1469

asked Mar 24 at 20:42

rds80rds80

1469

1 Answer
1

active

oldest

votes

1

Try with map

getActiveProgramNames(): Observable<string[]> 
 return this.getActivePrograms()
 .pipe(
 map(data => data.map(program => program.ProgramName.toString())
 );
 

share|improve this answer

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

add a comment | 

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1

Try with map

getActiveProgramNames(): Observable<string[]> 
 return this.getActivePrograms()
 .pipe(
 map(data => data.map(program => program.ProgramName.toString())
 );
 

share|improve this answer

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

add a comment | 

1

Try with map

getActiveProgramNames(): Observable<string[]> 
 return this.getActivePrograms()
 .pipe(
 map(data => data.map(program => program.ProgramName.toString())
 );
 

share|improve this answer

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

add a comment | 

Try with map

getActiveProgramNames(): Observable<string[]> 
 return this.getActivePrograms()
 .pipe(
 map(data => data.map(program => program.ProgramName.toString())
 );
 

share|improve this answer

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

getActiveProgramNames(): Observable<string[]> 
 return this.getActivePrograms()
 .pipe(
 map(data => data.map(program => program.ProgramName.toString())
 );
 

share|improve this answer

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142

answered Mar 24 at 20:51

Derviş KayımbaşıoğluDerviş Kayımbaşıoğlu

16.1k22142