jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

minor

Browse source
This commit is contained in:
Ilya Kantor 2019-05-21 18:05:46 +03:00
parent 3ce2d96948
commit 7d6d4366a3
5 changed files with 34 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

8
2-ui/1-document/03-dom-navigation/3-navigation-links-which-null/solution.md
View file

@ -1,4 +1,6 @@
1. Yes, true. The element `elem.lastChild` is always the last one, it has no `nextSibling`, so if there are children, then yes.
2. No, wrong, because `elem.children[0]` is the first child among elements. But there may be non-element nodes before it. So `previousSibling` may be a text node.
1. Yes, true. The element `elem.lastChild` is always the last one, it has no `nextSibling`.
2. No, wrong, because `elem.children[0]` is the first child *among elements*. But there may exist non-element nodes before it. So `previousSibling` may be a text node. Also, if there are no children, then trying to access `elem.children[0]`
Please note that for both cases if there are no children, then there will be an error. For instance, if `elem.lastChild` is `null`, we can't access `elem.lastChild.nextSibling`.
Please note: for both cases if there are no children, then there will be an error.
If there are no children, `elem.lastChild` is `null`, so we can't access `elem.lastChild.nextSibling`. And the collection `elem.children` is empty (like an empty array `[]`).