动态二维矩阵

Question

I have this code, which is giving me errors:

package main

import (
    "fmt"
)

func main() {
        var cnt = make([][]string,0,10)
        for i := 0; i < 5; i++ {
             var tmp = make([]string,0,8)
             for c := 0 ; c < 5 ; c++ {
                 tmp = append(tmp,"Matias")
              }
              cnt= append(cnt,tmp...)
         }
    fmt.Println(cnt)
}

It's giving me an error. Basically what I need is to have the slice to be as dinámic as possible. I don't know what the final length will be in any of the two dimensions.

Answer 1

The compiler error is actually misleading - it should quote you are using tmp... which is of a variadic of strings - instead it quotes tmp which is of the correct type []string which one could use to append to cnt:

main.go:14:15:cannot use tmp (type []string) as type [][]string in append

Anyway, using tmp..., go is turning tmp from a []string into individual string parameters. Effectively:

cnt = append(cnt, tmp[0], tmp[1], tmp[2], tmp[3], tmp[4])

And go can't append string to a [][]string type.

Change the line to:

cnt = append(cnt, tmp)