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Small pit on the definition of two-dimensional or multi-dimensional array / slice in go language

2022-04-22 15:50:00 【Mengo_ x】

Go A two-dimensional array of is an array of arrays , A two-dimensional slice is a slice of a slice .

First, a two-dimensional array can be defined as ：

dp := [2][2]int{
    }

But this The length must be a dead constant , If defined in this way, an error will be reported , Because variables are used .

m := 2
n := 2
dp := [m][n]int{
    }

If you have to use variables , Then you can only use slices .

We all know , A one-dimensional slice of a specific length can be used make( []Type, size, cap ) To define , How to define a two-dimensional slice ？

The answer is that it can only be defined by the slice of the slice , That is, first define a two-dimensional slice of a dimension , Then a loop is used to define the slice of the slice ：

leng := 4
a :=make([][]int ,leng)
  for i:=0;i<4;i++{
    
    a[i]=make([]int,leng)
  }

Although this loop can be used with double loop values , However, it is not as convenient as other languages to define two-dimensional arrays , Must be from 0 Start the cycle .

Slices of more dimensions are the same .

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https://yzsam.com/2022/04/202204221546084692.html

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