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Q&A

How to make this treewalker code having a regular for loop or a forEach() method?

+0
−3

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", "");
  } else {
    for (const child of e.childNodes) {
      replaceIn(child);
    }
  }
}

replaceIn(document.body);

I don't want to use a for...of loop here by principle, because I personally think its syntax is confusing.

How to make this tree walker having a regular for loop instead, or, alternatively, a forEach() method instead?

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1 answer

+3
−0

I personally think its syntax is confusing.

Well, it's just a matter of getting used to it, I guess :-)


Anyway, this code is just looping through all childNodes and in each iteration it calls the replaceIn function, passing the element as argument.

Therefore, you could replace the for..of with a traditional for loop:

function replaceIn(e) {
  if (e.nodeType == Node.TEXT_NODE) {
    e.nodeValue = e.nodeValue.replaceAll("a", "");
  } else {
    for (let i = 0; i < e.childNodes.length; i++) {
      replaceIn(e.childNodes[i]);
    }
  }
}

Or you could use the forEach method:

function replaceIn(e) {
  if (e.nodeType == Node.TEXT_NODE) {
    e.nodeValue = e.nodeValue.replaceAll("a", "");
  } else {
    e.childNodes.forEach(replaceIn);
  }
}

With both, you achieve the same result.

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