# Defining dynamic comments on the fly

**URL:** <https://es.discourse.group/t/defining-dynamic-comments-on-the-fly/1003>\
**Category:** 💡 Ideas\
**Tags:** proposal\
**Created:** [September 29, 2021, 11:49am UTC](https://es.discourse.group/t/defining-dynamic-comments-on-the-fly/1003 "2021-09-29T11:49:24Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![lightmare](https://yyz2.discourse-cdn.com/free1/user_avatar/es.discourse.group/lightmare/32/843_2.png) [@lightmare](https://es.discourse.group/u/lightmare)\
**Post date:** [September 29, 2021, 4:28pm UTC](https://es.discourse.group/t/defining-dynamic-comments-on-the-fly/1003/4 "2021-09-29T16:28:21Z")

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> [@GHNewbiee](#):
>
> For example, a built-in function such as `comment(start, end)` which internally declares the text between the two arguments as a comment is not something incredible. After that, `comment("<!--", "-->")` , `comment("/*", "*/")` and `comment("${", "}")` could be used in the content of the tagged template literals to track the concerned strings and "simulate" them as ES comments.

ES source code is first parsed, then executed. You cannot alter the parser's behaviour with a run-time function.

What you want has nothing to do with comments, actually. You're asking for backticks to be treated literally in a chunk of code, instead of terminating the template as they do now. I understand that. But that's not exclusive to comments, it's a problem outside comments, too:

```javascript
html`<div>can I have a backtick ` here? no.</div>`

```

A proven technique for embedding arbitrary text in a different language is with custom start/end tags.

- Shell: \<\<"TAG" \n anytext \n TAG
- PostgreSQL: $TAG$ anytext $TAG$
- C++: R"TAG( anytext )TAG"
- Lua: [====[anytext]====]
- Markdown: 3+ backticks on both ends

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