基于 JVM 的编程语言 Coteline
本文导语: Coteline 是一个全新的基于 JVM 的编程语言。Coteline 是 Ceylon 的超集，并保持对 Ceylon 的向后兼容。 比 Ceylon 改进的地方包括： "public as a service", because shared is not a good keyword. implements, because it is fancier than satisfies and it clo...
Coteline 是一个全新的基于 JVM 的编程语言。Coteline 是 Ceylon 的超集，并保持对 Ceylon 的向后兼容。
比 Ceylon 改进的地方包括：
"public as a service", because shared is not a good keyword.
implements, because it is fancier than satisfies and it closes the gap for existing J2EE 1.3 developers.
Call an object a singleton.
Use const in lieu of value.
Write def as a Hipster-compliant variant of function.
Ink Unit instead of void in your fine-crafted Coteline definitions.
contract and trait carry more meaning than interface (and who cares about the actual formal semantics of these?).
We think pray is a better replacement for assert, because this is what you actually do when you write assertions.
dynamic blocks are better named as unsafe blocks, because they escape the wonderland of static type checks.
Parametric types with in / out for contravariance and covariance are hard to manipulate. This is also way too reminiscent of the C# world. Coteline provides salvation with covar and contravar.
Last but not least, you can also write foreach loops in Coteline.
示例代码：
"The classic Hello World program"
public Unit hello(String name = "World") {
const str = "Hello, `` name ``!";
def work() => print(str);
work();
pray(1 == 1);
plop.plop();
foreach (i in {1, 2, 3}) {
print(i);
}
}
singleton plop {
public Unit plop() {
print("Oh Plop!");
}
}
"Run the module `better.ceylon.is.coteline`."
public Unit run(){
if (nonempty args=process.arguments) {
foreach (arg in args) {
hello(arg);
}
}
else {
hello();
}
}
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