Function Generator
Generate clean, ready-to-use functions instantly
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What do you actually want from a small helper function, and how long does the boring part take? A validator, a date formatter, a retry wrapper: the logic is five minutes and the edge cases are an hour. The Function Generator writes the whole thing from a description of what it should do, edge cases included.
Function Generator makes the decisions that eat the time: what to do with an empty list, which error to raise, where the guard clauses belong. Describe the behaviour in a sentence or two and one finished function comes back.
What is Function Generator?
Function Generator is an AI coding tool with one job: turn a described behaviour into a single function you can drop into a file. Not a whole app, not a class hierarchy. One function, with its parameters, its return value, its guard clauses and the failure path you would have written yourself after the third bug report.
Writing A Brief The Generator Can Build From
It writes what you describe, so a vague brief gets a vague function. Four things do most of the work.
- Name the inputs and their types. "Two dates as ISO strings" beats "some dates".
- Say what comes back, including the empty case and the error case.
- Give one real example: this input, that result.
- Mention the constraint that matters, such as no external packages allowed.
How Does Function Generator Work?
Write your brief in the prompt box, then open the advanced options and set at least the Language and the Output. Pick a model from the selector and generate. The result appears in the output card, where Copy puts it straight on your clipboard and Download as TXT keeps it next to the ticket.
If the function is close but not right, do not retype the brief. Open the last generation from the activity history panel, change one setting, and run it again.
Language, Code Style And Output Explained
| Option | What it changes | Where to start |
|---|---|---|
| Language | The syntax and standard library used | Auto-Detect, or name the language yourself |
| Code Style | How the function reads | Clean / Idiomatic for everyday work |
| Comment Level | How much explanation sits in the code | Light Comments, its starting value |
| Output | Code alone, or code plus something else | Code + Usage Example |
Four toggles sit under those. Add Comments, Include Error Handling and Include Example Usage are already on. Generate Tests is the one you switch on yourself, and it earns its place on anything touching money or dates. The Detail Level slider starts at 60 percent, and Custom Instructions is where a project rule goes, such as a naming convention.
Note Nothing is compiled or executed here. The Function Generator returns text, so run the function against your own tests before it reaches a branch anyone else pulls.
Who Should Use It?
Backend developers
You already know the behaviour you want. This writes the guard clauses and the error path you would have typed anyway.
People still learning
Set Code Style to Beginner-Friendly and Output to Code + Explanation, and every line arrives with a reason attached.
Anyone in a new language
You have the logic clear in Python and need it in Go. Pick the language and describe the behaviour.
Small Habits That Improve The Result
- Ask for one function per generation. Two at once and both get less attention.
- Turn on Generate Tests before anything goes into shared code.
- Choose Performance-Optimized as the Code Style when the function runs inside a loop over thousands of rows.
- Put the language version in Custom Instructions when the syntax has moved recently.
Free use with no account is the standing arrangement here, and each tool carries its own instructions behind the scenes rather than sharing one generic chat box. You choose a model from the selector, generate, and reopen any recent result from the session history. Function Generator sits with the rest of the coding tools on EizTools when you need something beside it.
Frequently Asked Questions
Can it write more than one function at a time?
It can, though one at a time gives a better result. Each function gets the full detail budget, and you can change the language or comment level on one without regenerating the other.
Does Function Generator run or test the code it writes?
No. Nothing is executed or compiled here. The function comes back as text, so run it yourself, run your own tests and check the edge cases before it goes anywhere near production.
What if the function must avoid outside libraries?
Say so in Custom Instructions: no external packages, standard library only. Without that line the generator will happily reach for a well known dependency, because nothing here can see your lockfile or your package manifest.
What is the difference between Code + Tests and the Generate Tests toggle?
Output changes the shape of the whole answer. The toggle adds tests to whichever shape you picked. Using both is fine, and the tests simply arrive with a little more care.
Writing a small function was never the hard part. Remembering the null check, the empty list and the wrong type is what eats the afternoon. Describe what you need in the box above, read what comes back, and keep the parts that fit your codebase.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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