donglisi8644 2012-09-07 02:43
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在Go中提取子字符串

I'm trying to read an entire line from the console (including whitespace), then process it. Using bufio.ReadString, the newline character is read together with the input, so I came up with the following code to trim the newline character:

input,_:=src.ReadString('
')
inputFmt:=input[0:len(input)-2]+"" //Need to manually add end of string

Is there a more idiomatic way to do this? That is, is there already a library that takes care of the ending null byte when extracting substrings for you?

(Yes, I know there is already a way to read a line without the newline character in go readline -> string but I'm looking more for elegant string manipulation.)

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  • dougan1465 2012-09-07 07:39
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    It looks like you're confused by the working of slices and the string storage format, which is different from what you have in C.

    • any slice in Go stores the length (in bytes), so you don't have to care about the cost of the len operation : there is no need to count
    • Go strings aren't null terminated, so you don't have to remove a null byte, and you don't have to add 1 after slicing by adding an empty string.

    To remove the last char (if it's a one byte char), simply do

    inputFmt:=input[:len(input)-1]
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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