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https://github.com/jbranchaud/til
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32 lines
1.0 KiB
Markdown
32 lines
1.0 KiB
Markdown
# Create A Map Of Strings
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[ReasonML](https://reasonml.github.io/en) has the [`Map.Make`
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functor](https://reasonml.github.io/api/Map.Make.html) in its standard
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library which allows you to create a `Map` module with a specific key type.
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Here is how we can make a map module with string keys.
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```reason
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module StringMap = Map.Make(String);
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```
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We can then use that module to to create an empty map followed by adding
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key-value pairs to it.
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```reason
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StringMap.empty
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|> StringMap.add("Morty", "Smith")
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|> StringMap.add("Rick", "Sanchez")
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|> StringMap.add("Scary", "Terry")
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|> StringMap.iter((first, last) => {
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print_endline(Printf.sprintf("%s %s", first, last));
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});
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/*
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Morty Smith
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Rick Sanchez
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Scary Terry
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*/
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```
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See the [live
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example](https://reasonml.github.io/en/try?rrjsx=true&reason=LYewJgrgNgpgBAZQC4CcCWA7A5gWQIYAOcAvHPgQHT4DWMAFMutgJQDcAUO45roRTMAJIAnuwA+APkSoe5CnjBg6AIhwgUI5QBo4yhMDRIAFsubip3bHIVLlAJTQBjatt0I8GR0ZgAvU+ekmXkobFQRHPBRhV2UAFRgUKP9JQNk+QwS6OgAzNBQAZyQdKDxC5hIpAG92ODgCJiQAfRgMMChMegAFBuyKfPrMJGyVAFJ8uDHXXIKiuBKytnYAXzYgA).
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