Iterating Over Arrays

Arrays can potentially contain a large amount of related data, and sometimes, we want to access and modify data in bulk. An easier way to achieve this is by looping through an array to work with its elements collectively.

We can traverse the entire array using a for loop. The len function provides us with the length of the array, which we can use in the loop condition to specify the number of iterations:

index


              12345678910
            
package main
import "fmt"

func main() {
    numbers := [] int { 5, 10, 15, 20, 25, 30, 25 }
   
    for i := 0; i < len(numbers); i++ {
        fmt.Printf("Element %d: %d\n", i, numbers[i])
    }
}

In the code above, we employ a for loop to iterate len(numbers) times, where len(numbers) represents the length of the array. Within the loop, we utilize the variable i for indexing and accessing the elements.

The following code increments all odd numbers and squares all even numbers in an array:

index


              1234567891011121314151617
            
package main
import "fmt"

func main() {
    numbers := [] int { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
   
    fmt.Println(numbers)
   
    for i := 0; i < len(numbers); i++ {
        if numbers[i] % 2 == 0 {
            numbers[i] *= numbers[i]
        } else {
            numbers[i]++
        }
    }
    fmt.Println(numbers)
}

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Seção 5. Capítulo 6