What steps should I follow to ensure that the processData function waits for the data returned by the getData function in Angular?

After calling the getData function, each object is stored in an array and returned. Now I need the processData function to await these results from getData and then further process them. However, when I try to console.log(cleaningData), I don't see any results. What could be wrong with my async/await logic here? What am I overlooking?


getData() {
 var dataBucket = [] 
 this.https.get('https:******FAKEURL*******').subscribe((response: any) => {
    console.log(response.data)
    for(let i = 0 ; i < response.data.length ; i++) {
       dataBucket.push(response.data[i])
    }
  });
  console.log(dataBucket);
  return dataBucket;     
 }

async processData() { 
  let cleaningData = await this.getData();
  console.log(cleaningData);
  //do something with cleaningData
}

Answer №1

When dealing with asynchronous functions in Angular, it is common practice to define the actions that should be taken once the function returns using a subscription model. This means that the logic for handling the return of an asynchronous function should start from within the subscription block rather than elsewhere in your code where you may be waiting for the function to complete.

    fetchData() {
    
        this.http.get('https:******FAKEURL*******').subscribe((response: any) => {
            
            var dataContainer = []   <-----declaration should be done here
    
            console.log(response.data)
    
            for(let i = 0 ; i < response.data.length ; i++){
             
              dataContainer.push(response.data[i])
            }
    
          this.processData(response)  <-------call processData here
          });
      }
    
    processData(response: any){    <-----no need for async and await
    
      // <----- perform operations on response data from fetchData()
    
      console.log(cleanedData);
    
      //manipulate cleanedData as needed
   }

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