Updating display on JS calculator

Question

I want to have my calculator to display "0" when cleared or no other numbers have been entered but when I start adding numbers I want the 0 to be replaced. Currently when I enter any number it replaces the number on the display to the number entered.

this.currentDisplay = "0"

numberData(number) {
        if (number === "." && this.currentDisplay.includes("."))
        return
        if (this.currentDisplay = "0") {
        this.currentDisplay = this.currentDisplay.toString().replace("0", number.toString())
        }
        else {
            this.currentDisplay = this.currentDisplay.toString() + number.toString()
        }
    }