rxjs - 'of' vs 'from' operator

Question

Is the only difference between Observable.of and Observable.from the arguments format? Like the Function.prototype.call and Function.prototype.apply?

Observable.of(1,2,3).subscribe(() => {})
Observable.from([1,2,3]).subscribe(() => {})

Answer 1

It is important to note the difference between of and from when passing an array-like structure (including strings):

Observable.of([1, 2, 3]).subscribe(x => console.log(x));

would print the whole array at once.

On the other hand,

Observable.from([1, 2, 3]).subscribe(x => console.log(x));

prints the elements 1 by 1.

For strings the behaviour is the same, but at character level.