Function Explainer

Ever stared at one function and thought, what does this actually return? Have you copied a clever snippet from an answer online without knowing what the second argument does? Function Explainer takes that single function and tells you, in plain English, what it does.

Not the file. Not the service. One function, read closely.

What is Function Explainer?

Function Explainer is built for the smallest useful unit of code. You paste a single function into the prompt box, which asks for the code you want explained, and the answer covers what it takes in, what it gives back, and what happens in between. Nothing about the wider architecture, because you did not ask about that.

How Does Function Explainer Work?

Paste one function, pick a model from the selector, open the advanced options accordion if you want to steer the answer, then generate. Take this Python helper:

def clamp(value, low, high):
    return max(low, min(value, high))

With Note Edge Cases on, the explanation says clamp holds a number inside a range, that min caps the top and max lifts the floor, and that passing low above high quietly returns low instead of raising. The output card carries a word count, a reading time, copy, share, listen and downloads as TXT, Word or HTML, and every run stays in the activity history panel for the session.

Four Settings That Change The Answer

Language accepts Auto-Detect or a named language such as TypeScript, Java or Ruby. Line-by-Line, Add Examples and Add Summary each make the answer longer, so switch them on one at a time. Custom Instructions is the place for a specific question, like "tell me whether this is safe to call twice".

When One Function Is Not Enough

The narrow focus is the strength and also the catch. A function that leans on things defined elsewhere gets read from its own body alone.

• Helpers called inside it are described from their names, since the tool cannot see them.
• A method on a class may need the class fields pasted with it to make sense.
• Whether the function is even reachable is a question about callers, not about this code.
• Behaviour that depends on config or environment values is guessed, not known.

Paste the helper alongside the function when the answer feels thin. If what you really have is a stack trace rather than a comprehension problem, the Error Fixer is the better tool, and the Coding Tools category has the rest.

EizTools runs free AI tools with a dedicated workspace per job, and Function Explainer is the narrow one for reading a single function. No account, no quota, no card. Pick a model family from the selector before each run, and if the first explanation reads too advanced, drop the audience setting and generate again.

Frequently Asked Questions

Understanding one function is often the whole task, and the answer is rarely worth a colleague's afternoon. Function Explainer gives you that reading on demand, at whatever depth you set.

Paste the function that stopped you into the box above and read what comes back.