golang remove suffix

In Golang, we often need to operate and process strings. One of the most basic operations is to delete the suffix of the string. This article will introduce how to remove the suffix of a string in Golang.

First of all, we need to understand a very important function strings.HasSuffix(str, suffix string) bool. Its function is to determine whether a string str ends with a suffix string. If so, it returns true, otherwise it returns false. The implementation of this function is very simple, just need to traverse the string comparison.

Now, we assume that there is a string str, and we are sure that it ends with the suffix suffix, so how to delete this suffix? We can achieve this through two methods: Slices and Concatenation.

Method 1: Slicing

We can remove the suffix from the string through slicing. The specific implementation is as follows:

func removeSuffixBySlice(str, suffix string) string {
    if strings.HasSuffix(str, suffix) {
        str = str[:len(str)-len(suffix)]
    }
    return str
}

Code explanation:

1. if strings.HasSuffix(str, suffix): First determine whether the string ends with a suffix;
2. str[:len(str)-len(suffix)]: Slice out the string without the suffix.

Method 2: String splicing

Another method is to remove the suffix from the string through string splicing. The specific implementation is as follows:

func removeSuffixByConcatenation(str, suffix string) string {
    if strings.HasSuffix(str, suffix) {
        str = strings.TrimSuffix(str, suffix)
    }
    return str
}

Code explanation:

1. if strings.HasSuffix(str, suffix): First determine whether the string ends with a suffix;
2. strings.TrimSuffix(str, suffix): Use the TrimSuffix function to remove the suffix.

Note:

1. When using these functions, you need to pay attention to whether the string is empty;
2. If the string has no suffix, the function will No processing;
3. When the string has multiple suffixes, the above two methods can only delete the last suffix.

Summary:

This article introduces two methods of removing string suffixes in Golang. We can choose the appropriate method according to our actual needs and implement it in the code. In addition, when processing strings, we also need to pay attention to some details, such as whether the string is empty, whether there are multiple suffixes, etc. These details need to be handled carefully.

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