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Add Java to supported languages in how-codeflash-works, add auth and GitHub App steps to java-installation, add Java tab to codeflash-all tip, reorder trace-and-optimize Java examples, and clarify Java class method syntax in one-function. Closes CF-1090 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
99 lines
2.8 KiB
Text
99 lines
2.8 KiB
Text
---
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title: "Optimize a Single Function"
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description: "Target and optimize individual functions for maximum performance gains"
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icon: "bullseye"
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sidebarTitle: "Optimize Single Function"
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keywords:
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[
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"function optimization",
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"single function",
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"class methods",
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"performance",
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"targeted optimization",
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"javascript",
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"typescript",
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"python",
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"java",
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]
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---
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Codeflash is essentially a function optimizer. When asked to optimize a function, Codeflash will analyze the function,
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any helper functions it calls, and the imports it uses. It will then generate multiple new versions of the function and its helper functions, that are
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optimized for efficiency and performance while being functionally equivalent to the original function.
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Codeflash tests if a function is optimized by running the function and comparing the output of the new function to
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the original function. If the outputs match and the runtime of the new function is smaller, then the function is considered optimized.
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Codeflash works best on pure functions that don't have side effects. It can also optimize functions with side effects, but
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your mileage may vary.
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## How to optimize a function
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To optimize a function, run the following command in your project:
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<Tabs>
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<Tab title="Python">
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```bash
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codeflash --file path/to/your/file.py --function function_name
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```
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</Tab>
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<Tab title="JavaScript">
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```bash
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codeflash --file path/to/your/file.js --function functionName
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```
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</Tab>
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<Tab title="TypeScript">
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```bash
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codeflash --file path/to/your/file.ts --function functionName
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```
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</Tab>
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<Tab title="Java">
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```bash
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codeflash --file src/main/java/com/example/Utils.java --function methodName
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```
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</Tab>
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</Tabs>
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If you have installed the GitHub App to your repository, the above command will open a pull request with the optimized function.
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If you want to optimize a function locally, add a `--no-pr` argument:
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<Tabs>
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<Tab title="Python">
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```bash
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codeflash --file path/to/your/file.py --function function_name --no-pr
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```
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</Tab>
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<Tab title="JavaScript / TypeScript">
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```bash
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codeflash --file path/to/your/file.ts --function functionName --no-pr
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```
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</Tab>
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<Tab title="Java">
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```bash
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codeflash --file src/main/java/com/example/Utils.java --function methodName --no-pr
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```
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</Tab>
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</Tabs>
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### Optimizing class methods
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To optimize a method `methodName` in a class `ClassName`:
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<Tabs>
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<Tab title="Python">
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```bash
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codeflash --file path/to/your/file.py --function ClassName.method_name
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```
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</Tab>
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<Tab title="JavaScript / TypeScript">
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```bash
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codeflash --file path/to/your/file.ts --function ClassName.methodName
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```
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</Tab>
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<Tab title="Java">
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```bash
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codeflash --file src/main/java/com/example/Utils.java --function methodName
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```
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In Java, use just the method name — no `ClassName.` prefix is needed. Codeflash discovers the method by name within the specified file.
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</Tab>
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</Tabs>
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