Prosty kalkulator

math.js

let obliczenia = 0;
math = {}
math.dodaj = 5
math.razy = 3

function oblicz(matm) {
  sort = Object.entries(matm).sort((k, v) => k[0].localeCompare(v[0]));
  for (i = 0; i < sort.length; i++) {
    switch (sort[i][0]) {
      case "dodaj":
        obliczenia = obliczenia + sort[i][1]
        break;
      case "razy":
        obliczenia = obliczenia * sort[i][1]
        break;
    }
  }
  return obliczenia
}

h = oblicz(math)
console.log(h) # → 15