What is the reason why Math.random() repeatedly generates random numbers in JavaScript traversal?

Analysis and solution for Math.random() to generate repeated random numbers in JavaScript array traversal

In JavaScript array traversal, if Math.random() is called multiple times in the loop to generate random numbers, duplicate results may occur. This is not caused by the defect of Math.random() itself, but a code logic problem. This article will analyze such problems and provide solutions.

The problem usually manifests as: in a loop, multiple calls to Math.random() generate random numbers and assign them to different variables, but the result is the same. Even if the random number generation part is extracted into independent functions, the problem still exists.

The root of the problem: variable overlay

The core of the problem lies in the reuse and overwrite of variables. If in a loop, Math.random() is called multiple times and the results are assigned to the same variable, the latter assignment will overwrite the previous one, resulting in a seemingly repeated random number.

Solution: Avoid variable name conflicts

The solution is simple: use a different variable name for each Math.random() result. Avoid overwriting the newly generated random number before it.

For example, if the code was originally:

 let randomValue = Math.random();
// ... some code ...
randomValue = Math.random(); // This covers the previous random number

It should be modified to:

 let randomValue1 = Math.random();
// ... some code ...
let randomValue2 = Math.random();

In this way, randomValue1 and randomValue2 will store different random numbers. This is the key to solving the problem, not modifying Math.random() function itself or other irrelevant operations. The core of the problem lies in the code logic errors, not the lack of randomness of Math.random() function.

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