How to measure the access speed to array elements in a program?

To measure the access speed to array elements in Go, you can use the time package to measure the execution time of a loop that sequentially accesses array elements. For example:

package main

import (
    "fmt"
    "time"
)

func main() {
    arr := make([]int, 1000000)
    // Fill the array
    for i := range arr {
        arr[i] = i
    }

    start := time.Now()
    sum := 0
    for i := 0; i < len(arr); i++ {
        sum += arr[i]
    }
    elapsed := time.Since(start)

    fmt.Printf("Sum: %d, Access time: %s\n", sum, elapsed)
}

This approach provides an approximate time for sequential access to array elements. For more precise measurements, you can use benchmarks with the testing package.