add @array.zip and @array.zip_with

[myfreess]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 5446

Details

• 13 of 13 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 92.607%

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Totals
Change from base Build 5440:	0.03%
Covered Lines:	5875
Relevant Lines:	6344

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💛 - Coveralls

[Lampese]

I have an API design concern, with Array zip, what about FixedArray? What about other linearly traversable structures? This leads to the discussion that Iter::zip, but our Iter can't do zip...

cc @bobzhang

[FlammeShadow]

It seems zip_with can be easily composed with zip and map?

[illusory0x0]

related issue.

• zip for arrays, iters, etc #994

[Yoorkin]

There is a zip function in immut/list:

/// Zip two lists.
/// If the lists have different lengths, it will return None.
pub fn zip[A, B](self : T[A], other : T[B]) -> T[(A, B)]?

It's a method that returns an option. To make the API more consistent, consider changing the API like this:

// in immut/list
pub fn zip[A, B](self : T[A], other : T[B]) -> T[(A, B)]

// in array
pub fn zip[A, B](self : T[A], other : T[B]) -> T[(A, B)]
pub fn zip_with[A, B, C](self : T[A], other : T[B], merge~ : (A,B)->C) -> T[C]

[Lampese]

I have an API design concern, with Array zip, what about FixedArray? What about other linearly traversable structures? This leads to the discussion that Iter::zip, but our Iter can't do zip...

cc @bobzhang

So that the zip for FixedArray is a todo issue?