61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package main
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import "fmt"
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// Slices are a key data type in Go, giving a more powerful interface to sequences than arrays
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func main() {
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// slices are typed only by the elements they contain (not the number of elements)
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// Here make a slice of strings of length 3 (initially zero-valued)
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s := make([]string, 3)
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fmt.Println("emp:", s)
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// set and get like with arrays
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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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// len returns the length of the slice as expected
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fmt.Println("len:", len(s))
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// returns a slice containing one or more new values
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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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// create an empty slice c of the same length as s and copy into c from s
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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 operators with the syntax slice[low:high]
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l := s[2:5]
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fmt.Println("sl1:", l)
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// slices up to (but excluding) s[5]
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l = s[:5]
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fmt.Println("sl2:", l)
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// slices up from (and including) s[2]
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l = s[2:]
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fmt.Println("sl3:", l)
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// declare and initialize a variable for slice in a single line
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t := []string{"g", "h", "i"}
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fmt.Println("dcl:", t)
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// Slices can be composed into multi-dimensional data structures
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// The length of the inner slices can vary, unlike with multi-dimensional arrays
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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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