class Counter {
    public count = 0

    incBy(value: number) {
        this.count += value
    }

    incByAmount(
        value: number, amount: number) {
        this.count += value * amount
    }
}

let counter = new Counter()
counter.incBy(1)
//counter.count is 1
console.log("count is", counter.count)

counter.incByAmount(2, 5)
//counter.count is 11
console.log("count is", counter.count)