"Go Learning note" 7, slice Slice

This is a creation in Article, where the information may have evolved or changed.

Sliced slice

• It is not an array by itself, he points to the underlying array
• As an alternative to variable-length arrays, you can associate local or all of the underlying array
• As a reference type
• You can create directly or get a build from the underlying array
• Use Len () to get the number of elements, and the cap () to get the capacity
• General use make () to create

• If multiple slice point to the same underlying array, one of the value changes affects all

• Make ([]t,len,cap)

• Where the cap can be omitted, and the Len value is the same
• Len represents the number of elements stored, and the CAP represents the capacity

1234	func Main ()make ([]int) fmt. Println (S1)}

Reslice

• Reslice indexes are subject to slice slices
• Index can not exceed the capacity cap () value of the slice slice
• Index out-of-bounds does not cause redistribution of the underlying array but throws an error

Append (Append ())

• You can append elements to the slice tail
• One slice can be appended to the other slice tail
• Returns the original slice if the final length does not exceed the capacity appended to the slice
• If the capacity of the appended slice is exceeded, the array is reassigned and the original data is copied

Copy

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func main () {s1: = []int {1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 }s2: = []int {11 , 12 , }copy (S1,S2) fmt. Println (S1) //[11 4 5 6 7 8] }