Object is possibly Null

Question

I want to get the id from the url and then use that to navigate to a different specific view I have the following function

getStudent(): void {
  const id = + this.route.snapshot.paramMap.get('id');
  this.studentService.getStudent(id)
     .subscribe(student => this.SpecificStudent = student);

I have tried to make sure it is not null by using the assertion

// !

const id = + this.route.snapshot.paramMap.get('id')!;

If I do this, it doesn’t show an error, but alert(id) gives 0 which is wrong

Answer 1

You can use the Number method:

Number(this.route.snapshot.paramMap.get('id'))

Or

this.route.paramMap.subscribe(param => {
      let id = +param.get('id');
})