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Joseph Overton
4,234 PointsIs backing property syntax not necessary in this case? this._x = x
In the Ashley's last course on getter and setter methods, when she was setting a property with the same name as the argument being passed in, she used a backing property that had an underscore in front of the name. The example i copied down was:
set owner(owner) { this._owner = owner;}
SO when i was writing this constructor method, I used that syntax, but she didn't. Any guidance on why this isn't necessary in this instance?
1 Answer
Steven Parker
231,141 PointsI didn't see any getter or setter used in that video.
But just in general, with a getter and setter in place, it would not matter if the property were referenced by name, or if the backing variable was accessed directly. A little more code would be involved in using the the property by name, but either way would cause the backing variable to be read or set.
Joseph Overton
4,234 Pointsno getter or setter methods in there, but i had assumed that I'd need to do the same thing with the constructor method. I had initially coded it like this
constructor(x, y) {
this._x = x
this._y = y }
her solution version just has constructor(x, y) { this.x = x this.y = y }
Steven Parker
231,141 PointsThe result is the same, hers just uses the setter and yours goes directly to the backing variable.
Glad I could help. You can mark a question solved by choosing a "best answer".
And happy coding!
Joseph Overton
4,234 PointsJoseph Overton
4,234 PointsI was assuming this question was going to be tied to the lesson i was doing, but, in case it isn't, this is where i am.
https://teamtreehouse.com/library/board-and-space-class-constructor-methods-solution
...specifically the constructor method for the Space class