go / beginner
Snippet
Slices: Dynamic Arrays in Go
Slices are growable dynamic views into arrays. Unlike arrays with fixed size, slices can grow or shrink using append(). The make() function creates a slice with pre-allocated capacity. Slicing with [start:end] creates a new view (reference) into the same underlying array.
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package mainimport "fmt"func main() {names := []string{"Alice", "Bob"}fmt.Printf("Initial: %v, Length: %d, Capacity: %d\n", names, len(names), cap(names))names = append(names, "Charlie")fmt.Printf("After append: %v, Length: %d, Capacity: %d\n", names, len(names), cap(names))slice := make([]int, 0, 5)slice = append(slice, 10, 20, 30)fmt.Printf("Made slice: %v\n", slice)sub := slice[1:3]fmt.Printf("Sub-slice [1:3]: %v\n", sub)}
Breakdown
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names := []string{"Alice", "Bob"}
Composite literal syntax creates a slice with two elements
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append(names, "Charlie")
append() adds elements and may reallocate if capacity is exceeded
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make([]int, 0, 5)
make(type, length, capacity) pre-allocates capacity without initializing elements
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slice[1:3]
Slice expression creates a sub-view from index 1 inclusive to 3 exclusive