Classes and Methods

Static Methods

Call a method on the class itself.

static-method A static method belongs to the class, not to one instance. Use it for helpers that do not need instance fields.

Static Methods

amount
static_method.js
Replay: real traced execution (multi-file project)
const amount = 8;
class Pricing {
  static addFee(value) {
    return value + 2;
  }
}

const total = Pricing.addFee(amount);

console.log("amount=" + amount);
console.log("total=" + total);

const amount = 12;
class Pricing {
  static addFee(value) {
    return value + 2;
  }
}

const total = Pricing.addFee(amount);

console.log("amount=" + amount);
console.log("total=" + total);

const amount = 20;
class Pricing {
  static addFee(value) {
    return value + 2;
  }
}

const total = Pricing.addFee(amount);

console.log("amount=" + amount);
console.log("total=" + total);

  1. amount ← 8

    1const amount→ 8 = 8; //@amount=12, 202class Pricing {3  static addFee(value) {4    return value + 2;5  }6}78const total = Pricing.addFee(amount8);

  2. static addFee(value)

    1const amount = 8; //@amount=12, 202class Pricing {3  static addFee(value8) {4    return value + 2;5  }

  3. total ← 10

    5  }6}78const total→ 10 = Pricing.addFee(amount8);910console.log("amount=" + amount8);11console.log("total=" + total10);
    outputamount=8
total=10

  1. amount ← 12

    1const amount→ 12 = 12;2class Pricing {3  static addFee(value) {4    return value + 2;5  }6}78const total = Pricing.addFee(amount12);

  2. static addFee(value)

    1const amount = 12;2class Pricing {3  static addFee(value12) {4    return value + 2;5  }

  3. total ← 14

    5  }6}78const total→ 14 = Pricing.addFee(amount12);910console.log("amount=" + amount12);11console.log("total=" + total14);
    outputamount=12
total=14

  1. amount ← 20

    1const amount→ 20 = 20;2class Pricing {3  static addFee(value) {4    return value + 2;5  }6}78const total = Pricing.addFee(amount20);

  2. static addFee(value)

    1const amount = 20;2class Pricing {3  static addFee(value20) {4    return value + 2;5  }

  3. total ← 22

    5  }6}78const total→ 22 = Pricing.addFee(amount20);910console.log("amount=" + amount20);11console.log("total=" + total22);
    outputamount=20
total=22