feat: init & playaround

go-by-example/slices/slices.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	// "slices"
+)
+
+func main() {
+
+	var s []string
+	fmt.Println("uninit", s, s == nil, len(s) == 0)
+
+	s = make([]string, 3)
+	fmt.Println("emp:", s, "len:", len(s), "cap:", cap(s))
+
+	s[0] = "a"
+	s[1] = "b"
+	s[2] = "c"
+
+	fmt.Println("set:", s)
+	fmt.Println("get:", s[2])
+
+	s = append(s, "d")
+	s = append(s, "e", "f")
+
+	fmt.Println("apd:", s)
+
+	f := make([]int, 3, 10)
+	fmt.Println("f:", f, "len:", len(f), "cap:", cap(f))
+
+	c := make([]string, len(s))
+	copy(c, s)
+	fmt.Println("cpy:", c)
+
+	l := s[2:5]
+	fmt.Println("sl1:", l)
+	// two d slices
+	twoD := make([][]int, 10)
+
+	for i := range len(twoD) {
+		innerLen := i + 1
+		twoD[i] = make([]int, innerLen)
+		for j := range innerLen {
+			twoD[i][j] = 1 + j
+		}
+	}
+	fmt.Println("2d: ", twoD)
+}