markdown ## 結論 在使用make初始化slice的時候，要考慮初始的長度，若是只用兩個參數會使長度等於容量，也就是已經初始化過了，這時再用append的話就不會如想像那樣從頭開始新增資料了！ ## 環境 go v1.19.6 ```go type Card struct { Word string Explain string } ``` ## 預期的對照組 * 這是正常運行的 ```go stackB := []Card{ { Word: "test", Explain: "test", }, { Word: "test2", Explain: "test2", }, { Word: "test3", Explain: "test3", }, } fmt.Println(stackB) // worked stackB = stackB[:2] fmt.Println(stackB) // worked ``` ## 非預期的狀況 ```go stack, _ := GetCardMap() fmt.Println(stack) // worked stack = stack[:2] fmt.Println(stack) // only 2 empty element func GetCardMap() (m []Card, err error) { file, err := os.Open("frequecydic.txt") if err != nil { return nil, err } defer file.Close() totalCount, err := VerifyDic(file) if err != nil { return nil, err } // move file pointer to the beginning of file _, err = file.Seek(0, io.SeekStart) if err != nil { return nil, err...
