feat!: replace elif with else if

[Chriscbr]

Closes #6969

While the language is still early, it feels like the right time to make some tiny ergonomic improvements. To align with other most other imperative languages and improve the ease of picking up Wing, this PR changes the syntax for multi-branch if statements to use the traditional "else if" over the conjoined "elif". After using the language for a while I don't think the choice to use "elif" has really helped save many keystrokes or improved readability, and it also makes it a bit more awkward to combine existing "if" and "else" blocks together.

BREAKING CHANGE: elif has been removed as a keyword, in favor of else if. We recommend running a simple find and replacement over your codebase (like find . -type f -name "*.w" -exec perl -pi -e 's/\belif\b/else if/g' {} +) to update to the new syntax.

Checklist

• Title matches Winglang's style guide
• Description explains motivation and solution
• Tests added (always)
• Docs updated (only required for features)
• Added pr/e2e-full label if this feature requires end-to-end testing

By submitting this pull request, I confirm that my contribution is made under the terms of the Wing Cloud Contribution License.

[github-actions]

Thanks for opening this pull request! 🎉
Please consult the contributing guidelines for details on how to contribute to this project.
If you need any assistance, don't hesitate to ping the relevant owner over Discord.

Topic	Owner
Wing SDK and standard library	@chriscbr
Wing Console	@skyrpex
Wing compiler and language design	@chriscbr
VSCode extension and language server	@chriscbr
Wing CLI	@chriscbr
Documentation	@boyney123
Examples	@boyney123
Wing Playground	@skyrpex

[monadabot]

Console preview environment is available at https://wing-console-pr-6976.fly.dev 🚀

Last Updated (UTC) 2024-08-02 15:32

[monadabot]

Benchmarks

Comparison to Baseline ⬜🟥⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜⬜

Benchmark	Before	After	Change
version	57ms±0.42	57ms±0.63	+0ms (+0.53%)⬜
empty.test.w -t sim	366ms±3.39	386ms±18.2	+19ms (+5.29%)🟥
empty.test.w -t tf-aws	617ms±7.08	614ms±4.93	-3ms (-0.43%)⬜
hello_world.test.w -t sim	417ms±8.91	405ms±5.48	-12ms (-2.96%)⬜
hello_world.test.w -t tf-aws	1513ms±23.58	1502ms±15.61	-11ms (-0.72%)⬜
jsii_big.test.w -t sim	2969ms±8.56	2971ms±14.97	+2ms (+0.07%)⬜
jsii_big.test.w -t tf-aws	3180ms±9.03	3199ms±15.62	+19ms (+0.61%)⬜
functions_1.test.w -t sim	405ms±3.96	410ms±3.35	+5ms (+1.11%)⬜
functions_1.test.w -t tf-aws	857ms±5.15	856ms±6.57	-1ms (-0.15%)⬜
functions_10.test.w -t sim	502ms±9.56	488ms±14.4	-14ms (-2.77%)⬜
functions_10.test.w -t tf-aws	2191ms±10.52	2184ms±26.16	-7ms (-0.3%)⬜
jsii_small.test.w -t sim	378ms±4.57	385ms±3.2	+8ms (+2.08%)⬜
jsii_small.test.w -t tf-aws	625ms±4.97	626ms±5.84	+1ms (+0.12%)⬜

⬜ Within 1.5 standard deviations
🟩 Faster, Above 1.5 standard deviations
🟥 Slower, Above 1.5 standard deviations

Benchmarks may vary outside of normal expectations, especially when running in GitHub Actions CI.

Results

name	mean	min	max	moe	sd
version	57ms	56ms	59ms	1ms	1ms
empty.test.w -t sim	386ms	364ms	435ms	18ms	25ms
empty.test.w -t tf-aws	614ms	602ms	623ms	5ms	7ms
hello_world.test.w -t sim	405ms	397ms	420ms	5ms	8ms
hello_world.test.w -t tf-aws	1502ms	1473ms	1550ms	16ms	22ms
jsii_big.test.w -t sim	2971ms	2936ms	2995ms	15ms	21ms
jsii_big.test.w -t tf-aws	3199ms	3168ms	3237ms	16ms	22ms
functions_1.test.w -t sim	410ms	403ms	418ms	3ms	5ms
functions_1.test.w -t tf-aws	856ms	843ms	874ms	7ms	9ms
functions_10.test.w -t sim	488ms	442ms	512ms	14ms	20ms
functions_10.test.w -t tf-aws	2184ms	2119ms	2230ms	26ms	37ms
jsii_small.test.w -t sim	385ms	378ms	393ms	3ms	4ms
jsii_small.test.w -t tf-aws	626ms	611ms	638ms	6ms	8ms

Last Updated (UTC) 2024-08-01 18:45

[monadabot]

Congrats! 🚀 This was released in Wing 0.81.0.