Use cases:

• Processing values inside scoped slots
• Processing values inside v-for (without creating a computed property for values)

Pros:

• Simple
• Handy

Cons:

• More logic inside templates

Current solutions and their limitations:

1. Create a computed property (impossible for values inside scoped slots)
2. Create methods for processing values. unoptimized (e.g., when processing the same value multiple times)
3. Use :set / :data-set hack - it's a hack and doesn't work for Vapor (currently)
4. Create a simple utility component - while this is currently the best option, it requires recreating the component each time

Given these limitations, I think we need a way to create derived values inside templates and Vue Macros seems like the perfect place to test this feature.

Proposed syntax:
We already have a similar syntax for scoped params, so I suggest something similar:

<div  v-let="{ a = msg + '!', b = msg + '?' }">
  {{ a }} {{ b }}
</div>

// OR

<div  v-const="{ a: msg + '!', b: msg + '?' }">
  {{ a }} {{ b }}
</div>

Thank you