futher simplify remove and shift_back operations in hashmap

bobzhang commented 1 month ago

simplify the remove operation
simplify shift_back
tweak

coderabbitai[bot] commented 1 month ago

Walkthrough

The recent updates to the HashMap module involve refactoring the remove and shift_back functions to streamline their loop structures using break and continue statements. Additionally, the grow function has been optimized for better capacity adjustment by introducing a new variable for a more concise capacity calculation. These changes aim to enhance the efficiency and readability of the code.

Changes

File	Change Summary
`hashmap/hashmap.mbt`	Simplified loop structures in the `remove` and `shift_back` functions; Optimized capacity adjustment in the `grow` function.

Sequence Diagram(s) (Beta)

sequenceDiagram
    participant Client
    participant HashMap

    Client->>HashMap: remove(key)
    loop Find the key
        HashMap->>HashMap: Check each slot
        alt Key found
            HashMap->>HashMap: Remove key-value pair
            HashMap->>HashMap: shift_back(start_index)
        else Key not found
            HashMap->>Client: Return
        end
    end

    Client->>HashMap: grow()
    HashMap->>HashMap: Calculate new_capacity
    HashMap->>HashMap: Adjust capacity

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coveralls commented 1 month ago

Pull Request Test Coverage Report for Build 1568

Details

2 of 3 (66.67%) changed or added relevant lines in 1 file are covered.
No unchanged relevant lines lost coverage.
Overall coverage remained the same at 89.094%

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
hashmap/hashmap.mbt	2	3	66.67%
<!--	Total:	2	3	66.67%	-->

Totals
Change from base Build 1567:	0.0%
Covered Lines:	2557
Relevant Lines:	2870

💛 - Coveralls

bobzhang commented 1 month ago

@coderabbitai review

coderabbitai[bot] commented 1 month ago

Actions performed

Review triggered. > Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

yj-qin commented 1 month ago

The 50% load factor will result in half of the space being wasted, maybe a higher load factor is better?

bobzhang commented 1 month ago

The 50% load factor will result in half of the space being wasted, maybe a higher load factor is better?

I am open to change the load factor later, rationale why I prefer 0.5 instead of higher values:

when people use hashtbl, they want the optimal performance, so it is okay to exchange space for speed
the wasted the space is not that bad, since the array only holds a pointer(not the full content)

moonbitlang / core