Arrays 101 Code from Java to Go(Array Deletions)

Array Deletions

Deleting From the End of an Array

Code(Creates an Array with room for 10 elements, and then adds elements into the first 6 indexes of it.)

Java

// Declare an integer array of 10 elements.
int[] intArray = new int[10];

// The array currently contains 0 elements
int length = 0;

// Add elements at the first 6 indexes of the Array.
for(int i = 0; i < 6; i++) {
    intArray[length] = i;
    length++;
}

Go

// Declare an integer array of 10 elements.
var intArray [10]int

// The array currently contains 0 elements
var length int = 0

for i := 0; i < 6; i++ {
    intArray[length] = i
    length++
}

Code(Deleting the last element of an Array)

Java

// Deletion from the end is as simple as reducing the length
// of the array by 1.
length--;

go

// Deletion from the end is as simple as reducing the length
// of the array by 1.
length--

Code(printArray function)

with length function

Java

for (int i = 0; i < intArray.length; i++) {
    System.out.println("Index " + i + " contains " + intArray[i]);
}

*- Print result

Index 0 contains 0.
Index 1 contains 1.
Index 2 contains 2.
Index 3 contains 3.
Index 4 contains 4.
Index 5 contains 5.
Index 6 contains 0.
Index 7 contains 0.
Index 8 contains 0.
Index 9 contains 0.

Go

for i := 0; i < len(intArray); i++ {
        fmt.Println("Index", i, "contains", intArray[i])
    }

*- Print result

Index 0 contains 0
Index 1 contains 1
Index 2 contains 2
Index 3 contains 3
Index 4 contains 4
Index 5 contains 5
Index 6 contains 0
Index 7 contains 0
Index 8 contains 0
Index 9 contains 0

with length variable

Java

for (int i = 0; i < length; i++) {
    System.out.println("Index " + i + " contains " + intArray[i]);
}

*- Print result
before the deletion

Index 0 contains 0.
Index 1 contains 1.
Index 2 contains 2.
Index 3 contains 3.
Index 4 contains 4.
Index 5 contains 5.

After the deletion

Index 0 contains 0.
Index 1 contains 1.
Index 2 contains 2.
Index 3 contains 3.
Index 4 contains 4.

Go

for i := 0; i < length; i++ {
        fmt.Println("Index", i, "contains", intArray[i])
    }

*- Print result
before the deletion

Index 0 contains 0
Index 1 contains 1
Index 2 contains 2
Index 3 contains 3
Index 4 contains 4
Index 5 contains 5

After the deletion

Index 0 contains 0
Index 1 contains 1
Index 2 contains 2
Index 3 contains 3
Index 4 contains 4

Code(Deleting From the Start of an Array)

Java

// Starting at index 1, we shift each element one position
// to the left.
for (int i = 1; i < length; i++) {
    // Shift each element one position to the left
    int_array[i - 1] = int_array[i];
}

// Note that it's important to reduce the length of the array by 1.
// Otherwise, we'll lose consistency of the size. This length
// variable is the only thing controlling where new elements might
// get added.
length--;

*- Print result

Index 0 contains 1.
Index 1 contains 2.
Index 2 contains 3.
Index 3 contains 4.

Go

for i := 1; i < length; i++ {
    // Shift each element one position to the left
    intArray[i-1] = intArray[i]
}

// Note that it's important to reduce the length of the array by 1.
// Otherwise, we'll lose consistency of the size. This length
// variable is the only thing controlling where new elements might
// get added.
length--;

*- Print result

Index 0 contains 1
Index 1 contains 2
Index 2 contains 3
Index 3 contains 4

Code(Deleting From Anywhere in the Array)

Java

// Say we want to delete the element at index 1
for (int i = 2; i < length; i++) {
    // Shift each element one position to the left
    int_array[i - 1] = int_array[i];
}

// Again, the length needs to be consistent with the current
// state of the array.
length--;

*- Print result

Index 0 contains 1.
Index 1 contains 3.
Index 2 contains 4.

Go

// Say we want to delete the element at index 1
for i := 2; i < length; i++ {
// Shift each element one position to the left
    intArray[i - 1] = intArray[i]
}
// Again, the length needs to be consistent with the current
// state of the array.
length--;

*- Print result

Index 0 contains 1
Index 1 contains 3
Index 2 contains 4