go slice 怎么追加到头部? - V2EX
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46fo

go slice 怎么追加到头部?

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  •   46fo Nov 9, 2018 7612 views
    This topic created in 2745 days ago, the information mentioned may be changed or developed.
    go slice 怎么追加到头部?自带的 append 是追加到尾部的。
    7 replies    2021-01-21 09:03:40 +08:00
    goofool
        1
    goofool  
       Nov 9, 2018 via Android   1
    额,两个参数换下位置?
    BBCCBB
        2
    BBCCBB  
       Nov 9, 2018   1
    将原来的数据往后移动几个位置, 然后把需要插入的数据放到前面, 参考 java 里 ArrayList 的 insert()实现
    GGGG430
        4
    GGGG430  
       Nov 9, 2018 via iPhone   1
    你把 append 的参数调换一下不就行了吗
    46fo
        5
    46fo  
    OP
       Nov 10, 2018   1
    @GGGG430
    @goofool 你们说的对 我以为 append 只有一种方法 就是追加单个元素
    搜了下发现
    append 的用法有两种:
    slice = append(slice, elem1, elem2)
    slice = append(slice, anotherSlice...)
    tomari
        6
    tomari  
       Dec 2, 2019
    @xdeng 还有另一种用法 slice = append([]byte,byte)
    这就导致一个结果,如果想要给一个 byte 切片首部追加的话,无法用楼上说的几种方法。。
    lawrenceneah92
        7/div>
    lawrenceneah92  
       Jan 21, 2021
    imgUrl := "/group1/2021/01/20/picture001.img"
    imgBytes := strings.Split(strings.Trim(imgUrl,"/"), "/")
    newBytes := append([]string{"head"},imgBytes...)
    fmt.Println(newBytes)
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