transform into ES5 syntax Javascript

Question

I'm trying to figure out how to convert this syntax into ES5 syntax.

moveUp() {
    this.row > 0 ? this.row -= 1 : this.row = 0
  }

Answer 1

The only part of that that isn't ES5 is the fact it's a method declaration. I'm assuming this is in an object literal, like this:

const obj = {
    moveUp() {
        this.row > 0 ? this.row -= 1 : this.row = 0;
    }
};

If so, the near-equivalent in ES5 is to use a function expression in a property initializer:

const obj = {
    moveUp: function() {
        this.row > 0 ? this.row -= 1 : this.row = 0;
    }
};

---

Side note: I recommend not using the conditional operator purely for side-effects like that. It's an if/else thing, use if / else (in ES5 or ES2015+):

const obj = {
    moveUp: function() {
        if (this.row > 0) {
            --this.row;
        } else {
            this.row = 0;
        }
    }
};

It's also questionable whether you need the else at all. Presumably nothing assigns a negative number to this.row , so you could probably just do this:

const obj = {
    moveUp: function() {
        if (this.row > 0) {
            --this.row;
        }
    }
};

Answer 2

If you are looking an "easier syntax" add the this.row = 0 to the else part of your if statement

moveUp(){
  if (this.row > 0){
    this.row -= 1
  } else {
    this.row = 0
  }
}

You can learn more about if statements here https://www.w3schools.com/js/js_if_else.asp