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Q&A How this recursive treewalker works?

Credit for User:Meriton for developing the following code (first published here). function replaceIn(e) { if (e.nodeType == Node.TEXT_NODE) { e.nodeValue = e.nodeValue.replaceAll("a", "");...

3 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by hkotsubo‭

#7: Post edited by (deleted user) · 2022-04-29T10:17:45Z (over 2 years ago)
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • How this recursive treewalker works?
  • As a side question which I grasp as important, can there be an even simpler and more direct version without the `else`?
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)).
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • How this recursive treewalker works?
  • As a side question which I grasp as important, can there be an even simpler and more direct version without the `else`?
#6: Post edited by user avatar Alexei‭ · 2022-04-29T06:09:45Z (over 2 years ago)
added relevant tags
#5: Post edited by (deleted user) · 2022-04-28T22:16:03Z (over 2 years ago)
  • Treewalker with just an if, no else
  • How this recursive treewalker works?
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • Can this be achieved without `else`?
  • If we just want to run on all characters in the document, why not do that in a direct command without conditioning?
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • How this recursive treewalker works?
  • As a side question which I grasp as important, can there be an even simpler and more direct version without the `else`?
#4: Post edited by (deleted user) · 2022-04-28T21:57:31Z (over 2 years ago)
  • Treewalker without just an if, no else
  • Treewalker with just an if, no else
#3: Post edited by (deleted user) · 2022-04-28T21:54:10Z (over 2 years ago)
  • Treewalker without an if-else conditioning
  • Treewalker without just an if, no else
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • Why does an if-else pattern is needed here and can the code be rephrased without it?
  • If we just want to run on all characters in the document, why not do that in a direct command without conditioning?
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • Can this be achieved without `else`?
  • If we just want to run on all characters in the document, why not do that in a direct command without conditioning?
#2: Post edited by (deleted user) · 2022-04-28T20:17:43Z (over 2 years ago)
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • Why does an if-else pattern is needed here and can the code be rephrased without it?
  • Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):
  • ```javascript
  • function replaceIn(e) {
  • if (e.nodeType == Node.TEXT_NODE) {
  • e.nodeValue = e.nodeValue.replaceAll("a", "");
  • } else {
  • for (const child of e.childNodes) {
  • replaceIn(child);
  • }
  • }
  • }
  • replaceIn(document.body);
  • ```
  • Why does an if-else pattern is needed here and can the code be rephrased without it?
  • If we just want to run on all characters in the document, why not do that in a direct command without conditioning?
#1: Initial revision by (deleted user) · 2022-04-28T19:58:30Z (over 2 years ago)
Treewalker without an if-else conditioning
Credit for [User:Meriton](https://software.codidact.com/users/53280) for developing the following code ([first published here](https://software.codidact.com/posts/286304/286317#answer-286317)):

```javascript
function replaceIn(e) {
  if (e.nodeType == Node.TEXT_NODE) {
    e.nodeValue = e.nodeValue.replaceAll("a", "");
  } else {
    for (const child of e.childNodes) {
      replaceIn(child);
    }
  }
}

replaceIn(document.body);
```

Why does an if-else pattern is needed here and can the code be rephrased without it?