goOtherMedium

Random sequence repeats identically across multiple runs

Time: 0:00

BugFind the bug and fix the code

What it should do

Generate an array of n random integers between 0 and 100. Example: generateRandomNumbers(5) -> [42, 99, 17, 73, 55]

What happens instead

The generated random sequence is identical across multiple runs of the program.

package main

import (
	"math/rand"
	"time"
)

func generateRandomNumbers(n int) []int {
	rand.Seed(time.Now().UnixNano())
	result := make([]int, n)
	for i := 0; i < n; i++ {
		result[i] = rand.Intn(101)
	}
	return result
}

func main() {
	println(generateRandomNumbers(5))
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

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Hint 3

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This bug belongs to the mutation and copying bugs pattern

Assignment does not copy, a shallow copy still shares its contents, and mutating methods return None.

Learn the mutation and copying bugs pattern Step through your own code

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package main import ( "math/rand" "time" ) func generateRandomNumbers(n int) []int { rand.Seed(time.Now().UnixNano()) result := make([]int, n) for i := 0; i < n; i++ { result[i] = rand.Intn(101) } return result } func main() { println(generateRandomNumbers(5)) }

Random sequence repeats identically across multiple runs

What it should do

What happens instead

More mutation and copying bugs to practise

Random sequence repeats identically across multiple runs

What it should do

What happens instead

More mutation and copying bugs to practise