Is there any difference between initializing a variable (like formGroup) inside the class directly or inside the constructor of class?

Question

I just wondering what is the difference between initializing formGroup inside the class or inside the constructor.

Creating them when we are declaring them like this:
```
form: FormGroup = this.formBuilder.group({})
```

Declare its variable and then create them in constructor of class

form: FormGroup;

constructor(private formBuilder: FormBuilder) {
    this.form = this.formBuilder.group({})
}

Are there any differences between these two approaches and what are the pros and cons of these two approaches?

user_4251829 · Answer

What you showed is the same approach (inlined initialization will be moved to the constructor by the compiler).

Using the FormBuilder in itself is a short form though.

form: FormGroup = new FormGroup({
  c1: new FormControl('')
});

==

form: FormGroup = this.fb.group({
  c1: ['']
});