foo.ts

import { from } from 'ix/iterable';
import { map } from 'ix/iterable/operators';

const compare = (a: string, b: string) =>
    from(a).pipe(map((value, index) => value === b[index]));

for (const v of compare('yes', 'yas')) {
    console.log(v);
}
// true
// false
// true