When the loop neglects to evaluate the condition properly and inaccurately filters the data

 this.authService.getmonthsandyear(this.id).subscribe(data => {   
  this.authService.startdate(this.id).subscribe(start_date_data => { 
    for (let a of data) { 
       if ( a.year && a.month !== start_date_data[0].month && start_date_data[0].year !== a.year) {
        this.authService.getmonthwiseyear(a.month, a.year, this.id).subscribe(data ={ 
          this.month.push((this.theMonths[Number(a.month - 1)]));
          this.month.push(a.year);  } else {}

The code above fails to execute the else loop when encountering the same month and year condition as specified in the commented-out if loop. In that template, all months belonging to the same year as the start date's year are being filtered instead of only the month of the year that matches the start month-year view image here

angulartypescriptif-statement

Answer №1

Based on my understanding of the issue, I believe this solution may help:

if (a.month !== start_date_data[0].month || start_date_data[0].year !== a.year) {
  // Dates do not match
}
else{
 // Dates match
}

If this does not resolve the problem, consider debugging your code with the following logs:

const differentMonth = a.month !== start_date_data[0].month;
const differentYear = a.year !== start_date_data[0].year;
console.log('Different month:', differentMonth);
console.log('Different year:', differentYear);
console.log('Different month or year:', differentMonth || differentYear);

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