Data Bundles (Slice, Map)

Go also has bundles for managing data together.

1. The line of boxes: slice []

This is the most common list-like structure.

shoppingList := []string{"apple", "banana"}

// Add (append)
shoppingList = append(shoppingList, "grape")

// Update (index)
shoppingList[0] = "strawberry"

fmt.Println(shoppingList)

Translation:

Create a string bundle called shoppingList
Add "grape" to the bundle and store it back
Change box 0 to "strawberry"

2. The labeled dictionary: map map

This is a dictionary-like structure where you look up values by key.

myInfo := map[string]string{
    "name": "Alex",
    "city": "Seoul",
}

// Add & update
myInfo["hobby"] = "Go coding"

// Delete
delete(myInfo, "city")

fmt.Println(myInfo)

Translation:

Create a labeled bundle called myInfo
Put "Go coding" under the "hobby" label
Delete the "city" label

In Go, it is important to clearly state the bundle type in advance (like []string or map[string]string).