What Are the Optimal Approaches for Generating Non-Repeating Random Numbers in JavaScript?

Generating Non-Repeating Random Numbers in JavaScript

The challenge of generating non-repeating random numbers arises when you need to ensure that each number in a given range is unique. To overcome this hurdle, let's explore alternative approaches.

Generating a Randomized List at the Start

One effective solution is to create a randomized list of the desired range at the outset. This ensures that you avoid the iterative approach, which could lead to excessive recursion and stack overflows. By calculating a random permutation of the numbers (like the example provided in the answer), you can simply iterate through the list to retrieve the random numbers in order.

Fisher–Yates Shuffle

Consider leveraging the Fisher–Yates Shuffle algorithm for improved efficiency. It involves randomly selecting an element from the remaining list and swapping it with the current element. This process is repeated until the entire list is randomized. The array is then iterated to retrieve the random numbers.

Using Generators

If generator support is available, this option can provide a clean and flexible approach. Generators allow you to yield a value one at a time without creating the entire array upfront. The example provided in the answer demonstrates how to use a generator to yield random numbers from the shuffled array.

In conclusion, the best method for generating non-repeating random numbers in JavaScript depends on the specific use case and efficiency requirements. While the iterative approach presented in the initial question may work for small ranges, larger ranges or frequent number retrieval necessitate more efficient solutions like the Fisher–Yates Shuffle or generators.

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