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Guide: formaly introduce map and vector literals

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This addresses issue 452.
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Nicolas Boulenguez 2021-05-29 10:52:32 +02:00 committed by Joel Martin
parent b89a93ab57
commit 2bbec8ac43
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process/guide.md
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@ -473,7 +473,12 @@ and each step will give progressively more bang for the buck.
a similar prefixed translation anyways).
* vector: a vector can be implemented with same underlying
type as a list as long as there is some mechanism to keep track of
the difference. You can use the same reader function for both
the difference.
Vector literals are similar to lists, but use bracket as
delimiters instead of parenthesis.
For example, `[]` constructs an empty vector and `[1 "a"]` a
vector with two elements.
You can use the same reader function for both
lists and vectors by adding parameters for the starting and ending
tokens.
* hash-map: a hash-map is an associative data structure that maps
@ -481,7 +486,13 @@ and each step will give progressively more bang for the buck.
strings, then you only need a native associative data structure
which supports string keys. Clojure allows any value to be a hash
map key, but the base functionality in mal is to support strings
and keyword keys. Because of the representation of hash-maps as
and keyword keys.
Hash-map literals are constructed with braces delimiters.
For example,
`{}` constructs an empty map,
`{"a" 1 :b "whatever"}` associates the `a` key to an integer value
and the `:b` key to a string value.
Because of the representation of hash-maps as
an alternating sequence of keys and values, you can probably use
the same reader function for hash-maps as lists and vectors with
parameters to indicate the starting and ending tokens. The odd