some important explanation

最新推荐文章于 2024-12-04 11:09:37 发布

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最新推荐文章于 2024-12-04 11:09:37 发布

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分类专栏： Erlang

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本文探讨了Erlang中元组和列表的应用场景，解释了如何使用元组来代替其他语言中的记录或结构体，并说明了列表适用于大小可变的数据结构。此外，文章还介绍了Erlang中字符串的表示方法，以及守卫表达式的限制。

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In general we can say we use tuples where we would use "records" or "structs" in other languages and we use lists when we want to represent things which have varying sizes, (i.e. where we would use linked lists in other languages).

Erlang does not have a string date type, instead strings can be represented by lists of ASCII characters. So the list[97,98,99] is equivalent to "abc". The Erlang shell is "clever" and guesses the what sort of list we mean and outputs it in what it thinks is the most appropriate form, for example:

30> [97,98,99].
"abc"

Only a few built in functions can be used in guards, and you cannot use functions you have defined yourself in guards. (Aside for advanced readers: This is to ensure that guards don't have side effects).

~p Writes the data with standard syntax in the same way as ~w, but breaks terms whose printed representation is longer than one line into many lines and indents each line sensibly. It also tries to detect lists of printable characters and to output these as strings.(求翻译)