KeyArray

KeyArray is like a row of buttons—exactly one button (the current key) is “pressed” at any time. Use it to model mutually exclusive states, mode selectors, toggles, or feature flags in your Rust projects.

---

Features

• Fixed-length list of keys where only one key is active
• O(1) switching of the active key by index
• Inspect current index, current key, or all keys
• Dynamically push, insert, or remove keys at runtime

---

Installation

Add KeyArray to your project with Cargo:

[dependencies]
keyarray = "0.0.1-alpha"

---

API Review

Method	Example	Description
KeyArray::new(keys: [K; N])	let arr = KeyArray::new(["On", "Off", "Auto"]);	Create a new key array, defaulting to index 0
KeyArray::new_with(keys, i)	let arr = KeyArray::new_with(["Low", "Med", "High"], 2);	Create with an explicit starting index
change(i)	arr.change(1);	Switch the active key by index (panics if out of bounds)
current_index()	let idx = arr.current_index();	Get the currently active key’s index
current()	let key = arr.current();	Get a reference to the currently active key
keys()	let all = arr.keys();	Borrow the slice of all keys
push(key)	arr.push("Turbo");	Append a key to the end
insert(i, key)	arr.insert(1, "Inserted");	Insert a key at a specific index
remove(i)	let removed = arr.remove(0);	Remove and return the key at the given index

---

Example

use keyarray::KeyArray;

fn main() {
    // Create with a default active key (index 0)
    let mut mykeys = KeyArray::new(["On", "Off", "Auto"]);

    // Create with an explicit starting index
    let mut other = KeyArray::new_with(["Low", "Medium", "High"], 2);

    // Change the active key by index (panics if out of bounds)
    mykeys.change(1);

    // Inspect the current state
    let idx = mykeys.current_index(); // 1
    let key = mykeys.current();        // "Off"
    let all = mykeys.keys();           // &["On", "Off", "Auto"]

    // Dynamically edit the key list
    mykeys.push("Turbo");              // ["On", "Off", "Auto", "Turbo"]
    mykeys.insert(1, "Inserted");      // ["On", "Inserted", "Off", ...]
    let removed = mykeys.remove(0);    // removes and returns "On"
}