dictionary
A map from string keys to values.
You can construct a dictionary by enclosing comma-separated key: value
pairs in parentheses. The values do not have to be of the same type. Since
empty parentheses already yield an empty array, you have to use the special
(:) syntax to create an empty dictionary.
A dictionary is conceptually similar to an array, but it is indexed by
strings instead of integers. You can access and create dictionary entries
with the .at() method. If you know the key statically, you can
alternatively use field access notation (.key) to
access the value. Dictionaries can be added with the + operator and
joined together. To check whether a key is present in
the dictionary, use the in keyword.
You can iterate over the pairs in a dictionary using a for loop. This will iterate in the order the pairs were inserted / declared.
Example
#let dict = (
name: "Typst",
born: 2019,
)
#dict.name \
#(dict.launch = 20)
#dict.len() \
#dict.keys() \
#dict.values() \
#dict.at("born") \
#dict.insert("city", "Berlin ")
#("name" in dict)
定义
函数和类型可以有与其关联的定义 (成员或方法)。可以使用 "." 操作符来访问调用它们。
len
The number of pairs in the dictionary.
at
Returns the value associated with the specified key in the dictionary. May be used on the left-hand side of an assignment if the key is already present in the dictionary. Returns the default value if the key is not part of the dictionary or fails with an error if no default value was specified.
key
The key at which to retrieve the item.
default
A default value to return if the key is not part of the dictionary.
insert
Inserts a new pair into the dictionary and return the value. If the dictionary already contains this key, the value is updated.
key
The key of the pair that should be inserted.
value
The value of the pair that should be inserted.
remove
Removes a pair from the dictionary by key and return the value.
key
The key of the pair to remove.
default
A default value to return if the key does not exist.
keys
Returns the keys of the dictionary as an array in insertion order.
values
Returns the values of the dictionary as an array in insertion order.
pairs
Returns the keys and values of the dictionary as an array of pairs. Each pair is represented as an array of length two.