Why Rust? Sum Types - InsanityBit

In a language like Java you often have to set a value to null and then later instantiate it to a valid value. Much of the standard library also uses null to indicate the absence of data. For example, if you attempt to ‘get’ an item from a map in Java, the item returned will be ‘null’ if it does not already exist. Much of the time null feels like an annoyance, and Java 8 has made tremendous improve

[tanakh]

直和型はいいぞ、っていうのをいまさら言わなければいけない世の中なのか(´･_･`)