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85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
---
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title: when two macros are faster than one
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draft: "false"
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---
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While working on my Database datapack (still WIP), I knew I'd want to find
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# scenario
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## dataset
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The data is stored in a storage `#_macro.array`. Array is populated with a total of 500 entries, each having `id` and `string` fields.
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```json
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[
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{
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id: 1,
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string: "entry1"
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},
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...
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{
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id: 500,
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string: "entry500"
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}
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]
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```
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## constraints
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The objective is to create an interface that receives a keyword, say `entry500`, and searches `#_macro.array` for an entry where the value of `string` matches the keyword.
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The keyword must be able to be entered by a player at runtime, and `#_macro.array` can have an arbitrary number of custom entries created by a player.
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In TypeScript, it would look something like this:
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```ts
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function searchArray(keyword: string) {
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// logic
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return theRelevantEntry
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}
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searchArray('entry500')
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```
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In mcfunction, this is not so easy. We *could* use macros
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# one macro
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Macros allow us to reach into our array and pick out an entry that matching value in the `string` property.
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```vb
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... one_macro.array[string:$(keyword)]
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```
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```vb
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'# one_macro/run.mcfunction
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data modify storage test_namespace:test_namespace temp.keyword set value 'entry500'
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function test_namespace:one_macro/_searcharray with storage test_namespace:test_namespace temp
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data remove storage test_namespace:test_namespace temp.keyword
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data remove storage test_namespace:test_namespace temp.result
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```
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```vb
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'# one_macro/_searcharray.mcfunction
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$data modify storage test_namespace:test_namespace temp.result set from storage test_namespace:test_namespace one_macro.array[string:$(keyword)]
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```
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# two macro
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```vb
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'# two_macro/run.mcfunction
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data modify storage test_namespace:test_namespace temp.keyword set value 'entry500'
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function test_namespace:two_macro/_searchindex with storage test_namespace:test_namespace temp
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function test_namespace:two_macro/_searcharray with storage test_namespace:test_namespace temp
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data remove storage test_namespace:test_namespace temp.keyword
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data remove storage test_namespace:test_namespace temp.index
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data remove storage test_namespace:test_namespace temp.result
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```
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```vb
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'# two_macro/_searchindex.mcfunction
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$data modify storage test_namespace:test_namespace temp.index set from storage test_namespace:test_namespace two_macro.index.$(keyword)
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```
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```vb
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'# two_macro/_searcharray.mcfunction
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$data modify storage test_namespace:test_namespace temp.result set from storage test_namespace:test_namespace two_macro.array[$(index)]
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``` |