clean up some deprecated function

[Yoorkin]

remove some deprecated function:

• fold_left, fold_right, fold_lefti, fold_righti, ...
• List::concat_map, Ref::ref, Iter::tap
• pop_exn, head_exn, nth_exn, ...
• some util function in test package

[coderabbitai]

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[peter-jerry-ye-code-review]

Based on the provided git diff output, it seems there are several deprecations and redundant functions being removed or updated across multiple files. Here are three key observations:

1. Deprecation of new_with_index in Favor of makei:

   • The function Array::new_with_index and FixedArray::new_with_index are deprecated and replaced with Array::makei and FixedArray::makei respectively. This change is made to standardize the creation of arrays with index-based value initialization.
   • Suggestion: Ensure that all references to new_with_index are updated to use makei to maintain compatibility with future versions.

2. Deprecation of Fold Functions:

   • Various fold functions like fold_left, fold_right, fold_lefti, and fold_righti are deprecated in favor of fold, rev_fold, foldi, and rev_foldi. This consolidation aims to reduce redundancy and simplify the API.
   • Suggestion: Update any use of the deprecated fold functions to their respective replacements to ensure future code stability and performance improvements, if any.

3. Removal of Exception-Based Functions:

   • Functions like pop_exn, peek_exn, and similar are being removed in favor of their unsafe counterparts. This suggests a move towards more explicit error handling rather than relying on exceptions.
   • Suggestion: Review and update code to handle potential unsafe operations explicitly, such as using unsafe_pop instead of pop_exn, to manage exceptions more predictably and to adhere to the new design philosophy.

These changes indicate a move towards a more streamlined and standardized API, emphasizing explicit error handling and reducing redundancy. It's crucial to update affected codebases accordingly to avoid issues with future updates and to leverage the potential performance and maintainability benefits of the new design.

[coveralls]

Pull Request Test Coverage Report for Build 3159

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 0.0%

---

Files with Coverage Reduction	New Missed Lines	%
array/array.mbt	1	0.0%

Totals
Change from base Build 3157:	0.0%
Covered Lines:	0
Relevant Lines:	4761

---

💛 - Coveralls

[bobzhang]

instead of removing them, shall we use the convention e.g, create a file called deprecated.mbt and put them all together to avoid some breakage. Keep them for a bit longer, e.g, a couple of months?

[Yoorkin]

instead of removing them, shall we use the convention e.g, create a file called deprecated.mbt and put them all together to avoid some breakage. Keep them for a bit longer, e.g, a couple of months?

putting them together in deprecated.mbt looks good to me

[qazxcdswe123]

Some may use @pkg.func, will this be affected if we move them to separated file?

[bobzhang]

Some may use @pkg.func, will this be affected if we move them to separated file?

No, it is backwards compatible

[Yoorkin]

I found that it's quite dangerous to move functions around because some files are associated with target platforms. I have to check the moon.pkg.json and move them to deprecated_js.mbt, deprecated_nonjs.mbt, or deprecated_all.mbt carefully. It feels bad at experience.

Maybe it's better to move deprecated functions to the bottom of the files, or just keep them there? @bobzhang