pp.ts

// OOP ?
class TheProblemSolver {
  solve(problem: Problem){ }
}

const problemSolver = new TheProblemSolver()
problemSolver.solve(p)

// OR just pure functional if it pure
function solveProblem(problem: Problem) { }
solveProblem(p)

// OR if it pure? use static property ! stick to the class
class TheProblemSolver {
  public static solve(problem: Problem){ }
}
TheProblemSolver.solve(p)

// OR more complicate paradigm
const ioc = new Container()
ioc.bind(TheProblemSolver).toSelf()
ioc.get(TheProblemSolver).solve(p)