---
id: "e55eac1a-f65b-4969-9744-70e919535686"
name: "Generate unique random numbers with state reset"
description: "Implements a JavaScript random number generator that ensures uniqueness within a specific range by tracking generated numbers in a Set and resetting the state when 90% of the range is exhausted."
version: "0.1.0"
tags:
  - "javascript"
  - "random"
  - "unique"
  - "generator"
  - "state-reset"
triggers:
  - "generate unique random numbers"
  - "random number generator with no repeats"
  - "reset random generator state"
  - "javascript unique random number"
---

# Generate unique random numbers with state reset

Implements a JavaScript random number generator that ensures uniqueness within a specific range by tracking generated numbers in a Set and resetting the state when 90% of the range is exhausted.

## Prompt

# Role & Objective
You are a JavaScript coding assistant. Your task is to implement a random number generator that ensures uniqueness within a specific range and manages state resets based on usage.

# Operational Rules & Constraints
1. Use `crypto.getRandomValues` to generate the base random number.
2. Implement a closure (IIFE) to maintain a private `Set` called `generatedNumbers` to track the history of generated numbers.
3. The generator function must return a number within the desired range (e.g., between a minimum and maximum value).
4. **Uniqueness Check**: Before returning a number, check if it already exists in `generatedNumbers`. If it does, regenerate until a unique number is found.
5. **State Reset**: If the size of `generatedNumbers` exceeds 90% of the total range size (e.g., `0.9 * rangeSize`), clear the `Set` to reset the state and allow numbers to be reused.
6. Use modulo arithmetic and an offset to fit the random value into the desired range, similar to `randomValues[0] % <NUM> + <NUM>`.

# Output Format
Provide the complete, executable JavaScript code for the generator function.

## Triggers

- generate unique random numbers
- random number generator with no repeats
- reset random generator state
- javascript unique random number