Pointers §16. Structs §17. Value Parts - to gain a deeper understanding into Go values. §18. Arrays, Slices and Maps - first-class citizen container types. §19. Strings §20. Functions - function types and syntax and semantics design details, some of them involved values of certain kinds of types (mainly slices, interfaces and channels), and a few of them were §0. About Go 101 4 related to standard package the corresponding arguments of %x should be strings, integers, integer arrays or integer slices (arrays and slices will be explained in a later article). %s, which will be replaced with the string representation

performance ...................................................................154 Chapter 7—Arrays and Slices ............................................................................................157 array to a function .....................................................................163 7.2 Slices ................................................................................................ new() and make() ........................................................170 7.2.5 Multidimensional slices ..............................................................................171 7.2.6 The bytes

Pointers §16. Structs §17. Value Parts - to gain a deeper understanding into Go values. §18. Arrays, Slices and Maps - first-class citizen container types. §19. Strings §20. Functions - function types and syntax and semantics design details, some of them involved values of certain kinds of types (mainly slices, interfaces and channels), and a few of them were related to standard package APIs. What are the the corresponding arguments of %x should be strings, integers, integer arrays or integer slices (arrays and slices will be explained in a later article). %s, which will be replaced with the string representation

Pointers §16. Structs §17. Value Parts - to gain a deeper understanding into Go values. §18. Arrays, Slices and Maps - first-class citizen container types. §19. Strings §20. Functions - function types and syntax and semantics design details, some of them involved values of certain kinds of types (mainly slices, interfaces and channels), and a few of them were related to standard package APIs. What are the the corresponding arguments of %x should be strings, integers, integer arrays or integer slices (arrays and slices will be explained in a later article). %s, which will be replaced with the string representation

workspace 8. Diving into the language 9. Variables 10. Basic types 11. Strings 12. Arrays 13. Slices 14. Maps 15. Loops 16. Conditionals 17. Operators 18. Structs 19. Functions 20. Pointers Due to this limitation, arrays are rarely used directly in Go, but instead we use slices (more on them later). Slices use arrays under the hood, so it’s still necessary to know how they work. You can elements are stored continuously in memory. 13. Slices A slice is a data structure similar to an array, but it can change in size. Under the hood, slices use an array and they are an abstraction built

expressions new(File) and &File{} are equivalent. Composite literals can also be created for arrays, slices, and maps, with the field labels being indices or map keys as appropriate. In these examples, the allocation. The built-in function make(T, args) serves a purpose different from new(T). It creates slices, maps, and channels only, and it returns an initialized (not zeroed) value of type T (not *T). The array), the length, and the capacity, and until those items are initialized, the slice is nil. For slices, maps, and channels, make initializes the internal data structure and prepares the value for use

slice , and initialize its data. slice := []byte {'a', 'b', 'c', 'd'} slice can redefine existing slices or arrays. slice uses array[i:j] to slice, where i is the start index and j is end index types are bytes var ar = [10]byte {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'} // define two slices with type []byte var a, b []byte // 'a' points to elements from 3rd to 5th in array ar. a = ar[2:5] define an array var array = [10]byte{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'} // define two slices var aSlice, bSlice []byte // some convenient operations aSlice = array[:3] // equals to aSlice

your way forward! Prototype Example: Designing Go support for numerical apps Multi-dimensional slices for Go (issue #6282) var matrix [,]float64 matrix = make([,]float64, 15, 11) 5 j matrix[i,j] implementation? ○ What notation? ○ etc. 6 Observation We can implement many aspects of multi-dimensional slices in Go now: ● Slice representation ⇨ Define an (abstract data) type ● Creation, access, mutation

Run-time Run-time handles memory allocation and collection, stack handling, goroutines, channels, slices, maps, reflection, and more. Solid but improving. 6g has good goroutine support, muxes them onto They will add complexity so must be done right. Generics would definitely be useful, though maps, slices, and interfaces address many common use cases. Collections can be built using the empty interface

时，只有引用（地址）被复制。 如果 r1 的值被改变了，那么这个值的所有引用都会指向被修改后的内容，在这个例子中，r2 也会受到影 响。 在 Go 语言中，指针（第 4.9 节）属于引用类型，其它的引用类型还包括 slices（第 7 章），maps（第 8 章）和 channel（第 13 章）。被引用的变量会存储在堆中，以便进行垃圾回收，且比栈拥有更大的内存 空间。 4.4.3 打印 函数 Printf .. } 也可以使用 for-range 的生成方式： IDIOM: for i,_:= range arr1 { ... } 在这里i也是数组的索引。当然这两种 for 结构对于切片（slices）（参考 第 7 章）来说也同样适用。 问题 7.1 下面代码段的输出是什么？ a := [...]string{"a", "b", "c", "d"} for i := range a { 量。下图给出了一个长度为 2，容量为 4 的切片。 y[0] = 3 且 y[1] = 5 。 切片 y[0:4] 由 元素 3, 5， 7 和 11 组成。 示例 7.7 array_slices.go package main import "fmt" func main() { var arr1 [6]int var slice1 []int = arr1[2:5]