2017-09-19 05:37
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I am trying to check if a given character is present in a byte:

//readBuf: []byte
//n: int
for i:=0;i<n;i++{
    if readBuf[i]=="?"{
        return true

"?" is of type string, so I am getting an error, since readBuf[i] is a byte. How can I convert "?" to a byte to be able to compare it to readBuf[i]?

It seems that []byte("?")[0] is working (convert the 1-element string to 1-element byte array, the extract the first value), but I am sure this is not the correct way of doing it.

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1条回答 默认 最新

  • dongmo9996 2017-09-19 05:51

    The rune literal '?' is the untyped integer value of the question mark rune.

    Use bytes.ContainsRune:

    if bytes.ContainsRune(readBuf[:n], '?') {
       return true

    Because the character ? is encoded as a single byte in UTF-8, the test can also be written as:

    for _, b := range readBuf[:n] {
        if b =='?'{   
            return true
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