forked from steger/pr3-sose2026
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
package main
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import (
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"fmt"
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"slices"
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)
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func main() {
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// A slice is a dynamically-sized, flexible view into the elements of an array.
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// In practice, slices are much more common than arrays.
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var s []string
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fmt.Println("uninit:", s, s == nil, len(s) == 0)
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// To create an empty slice with non-zero length, use the built-in make function.
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s = make([]string, 3)
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fmt.Println("emp:", s, "len:", len(s), "cap:", cap(s))
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// Set and get a value.
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s[0] = "a"
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s[1] = "b"
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s[2] = "c"
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fmt.Println("set:", s)
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fmt.Println("get:", s[2])
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fmt.Println("len:", len(s))
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// Slices can be resliced. This does not copy the slice data.
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s = append(s, "d")
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s = append(s, "e", "f")
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fmt.Println("apd:", s)
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// Deep copy a slice. This creates a new slice with the same length and copies the
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// elements from the original slice to the new slice.
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c := make([]string, len(s))
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copy(c, s)
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fmt.Println("cpy:", c)
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// Slices support a "slice" operator with the syntax slice[low:high].
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// This selects a half-open range which includes the first element, but excludes the last one.
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l := s[2:5]
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fmt.Println("sl1:", l)
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// This slices up to (but excluding) index 5.
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l = s[:5]
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fmt.Println("sl2:", l)
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// This slices from index 2 to the end of the slice.
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l = s[2:]
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fmt.Println("sl3:", l)
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// You can declare and initialize a slice in a single line as well.
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t := []string{"g", "h", "i"}
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fmt.Println("dcl:", t)
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// The builtin "slices" package provides a function Equal to compare two slices for equality.
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t2 := []string{"g", "h", "i"}
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if slices.Equal(t, t2) {
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fmt.Println("t == t2")
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}
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// Slices can be composed into multi-dimensional data structures. The length of the inner slices can vary.
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twoD := make([][]int, 3)
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for i := 0; i < 3; i++ {
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innerLen := i + 1
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twoD[i] = make([]int, innerLen)
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for j := 0; j < innerLen; j++ {
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twoD[i][j] = i + j
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}
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}
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fmt.Println("2d: ", twoD)
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}
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