Change Password

Please enter the password.
Please enter the password. Between 8-64 characters. Not identical to your email address. Contain at least 3 of uppercase, lowercase, numbers, and special characters (such as @*&#).
Please enter the password.
Submit

Change Nickname

Current Nickname:
Submit

v4.2
Search
中文EN
v4.2

    head()

    Function head() returns the first element of the array, namely, the element with index [0].

    Arguments:

    • Array <array>

    Returns:

    • First element <string>

    Common Usage

    Example: Find a 3-step path from Card CA002 to CA005, and return the 1st edge of the path.

    n({_id == "CA002"}).e()[3].n({_id == "CA005"}).limit(1) as p
    return head(pedges(p))
    
    Please complete the following information to download this book
    *
    公司名称不能为空
    *
    公司邮箱必须填写
    *
    你的名字必须填写
    *
    你的电话必须填写
    *
    你的电话必须填写