Enhance Wasmer::XxxArray

[irxground]

ref: #14
Now Wasmer::XxxArray has each method and include Enumerable module.

The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collection.
https://docs.ruby-lang.org/en/2.6.0/Enumerable.html

[Hywan]

I think we can write:

for nth in self.offset..view.len() {
    let value = view[nth].get() as i64;
    VM::yield_object(Integer::from(value))
}

It's more Rust idiomatic, and it avoids misusing the stop condition.

[irxground]

I fixed.

[Hywan]

Should we support <=>, so that max, min and sort can be used? Just in order to get a full implementation of Enumerable. Or… maybe integers are automatically supported, and then, <=> isn't required?

[Hywan]

bors try

[bors]

try

Build succeeded

• ci/circleci: build-and-test

[irxground]

Since the type of elements such as Int8Array is always an integer, sort works well.

If we implement the method <=>, the following code will work, but I think it is unnecessary.

mem1 = instance.memory.int8_view
mem2 = another_instance.memory.int8_view
[mem1, mem2].sort!

Note: Ruby's sort returns a sorted array. sort! sorts itself.

[Hywan]

I agree sort isn't very useful here. Let's see if there is a need!

[Hywan]

bors r+

[Hywan]

Thanks for the great PR!

[bors]

Build succeeded

• ci/circleci: build-and-test

[dnsco]

This is awesome!