Исходники и презентации

lessons/slices_and_arrays/array_operations/main.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+func accessToElement1() {
+	data := [3]int{1, 2, 3}
+
+	idx := 4
+	fmt.Println(data[idx]) // panic
+
+	fmt.Println(data[4]) // compilation error
+}
+
+func accessToElement2() {
+	data := [3]int{1, 2, 3}
+
+	idx := -1
+	fmt.Println(data[idx]) // panic
+
+	fmt.Println(data[-1]) // compilation error
+}
+
+func arrayLen() {
+	data := [10]int{}
+	fmt.Println(len(data)) // 10
+}
+
+func capArray() {
+	var data [10]int
+	fmt.Println(cap(data)) // 10
+}
+
+func arraysComparison() {
+	first := [...]int{1, 2, 3}
+	second := [...]int{1, 2, 3}
+
+	// except arrays whose element types are incomparable types
+	fmt.Println(first == second)
+	fmt.Println(first != second)
+
+	//	[<, <=, >, >=]  ->  compilation error
+}
+
+func emptyArray() {
+	var data [10]byte
+	fmt.Println(unsafe.Sizeof(data)) // 10
+
+	//data == nil // compilation error
+}
+
+func zeroArray() {
+	var data [0]int
+	fmt.Println(unsafe.Sizeof(data)) // 0
+}
+
+func arrayOfEmptyStructs() {
+	var data [10]struct{}
+	fmt.Println(unsafe.Sizeof(data)) // 0
+}
+
+func negativeArray() {
+	var data [-1]int // compilation error
+	_ = data
+}
+
+func arrayCreation() {
+	length1 := 100
+	var data1 [length1]int // compilation error
+	_ = length1
+	_ = data1
+
+	const length2 = 100
+	var data2 [length2]int
+	_ = data2
+}
+
+func makeArray() {
+	_ = make([10]int, 10) // compilation error
+}
+
+func appendToArray() {
+	_ = append([10]int{}, 10) // compilation error
+}