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This article introduces the relevant knowledge of "what is the reason why the Go language Slice slicing operation will confuse the original data?" in the actual case operation process, many people will encounter such a dilemma, and then let the editor lead you to learn how to deal with these situations! I hope you can read it carefully and be able to achieve something!

In the process of learning the Go language, we all know that slicing can be done through slicing operation.

For example

Sl: = make ([] int) 10) a = sl [1:] / means to take the element starting with subscript 1 to the end b = sl [: 5] / / to take the element with subscript from 0 to the element with subscript 4 c = sl [1:5] / / to take the element with subscript from 1 to the element with subscript 4 d = sl [1:5:6] / / to take the element with subscript from 1 to element with subscript 4 And set the capacity of the new slice to 6 * Note, this operation is critical to make a deep copy of the original slice.

The slices obtained when the slice is obtained through [mvig n] are all based on the underlying array of the original slice, that is, when you have some data in the new slice, the data of the original slice will also be changed, which is not usually what we want. Of course, if the expansion does not occur when using append () to operate on the new slice, then the value of the original slice will also change, so It is recommended to use [m:n:s] as much as possible when performing the slice acquisition operation. This is usually to open up a new space to copy the data of the original slice. Of course, if the slicing operation is to change the original slice, try to use [MRAN], which will save the space opened up by memory.

Code demonstration:

A: = [10] int {1,2} I: = a [: 6] y: = [] int {3prit 4} fmt.Printf ("a->% drect a->% v\ n", cap (a), a) fmt.Printf ("I->% drect I->% v\ n", cap (I), I) fmt.Printf ("y->% drect y->% v\ n", cap (y) Y) fmt.Println ("= =") / / I [0] = 100 / / fmt.Printf ("a->% d _ r _ r a->% v\ n", cap (a), a) / / fmt.Printf ("I->% d _ line I->% v\ n", cap (I), I) / / fmt.Printf ("y->% d _ r y->% v\ n", cap (y)) Y) / / fmt.Println ("=") I = append (I, y...) Fmt.Printf ("a->% drecinct a->% v\ n", cap (a), a) fmt.Printf ("I->% drect I->% v\ n", cap (I), I) fmt.Printf ("y->% drect y->% v\ n", cap (y), y)

Results:

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