Golang common methods

As a fast, statically typed programming language with a garbage collection mechanism, Go language has the advantages of high readability, simple syntax, and does not sacrifice the performance of the code. During development, some common Golang methods are often forgotten, and these methods are the key to helping us improve development efficiency. This article will introduce some common methods in Golang.

1. String operations

String operations are very common in programming, and Golang also provides many built-in methods to process strings. The following are some commonly used string operations:

• len(str): Get the string length
• strings.Contains(str, substr) : Determine whether the string str contains a substring substr
• strings.HasPrefix(str, prefix): Determine whether the string str Whether to be prefixed by prefix
• strings.HasSuffix(str, suffix): Determine whether the string str With suffix as the suffix
• strings.Index(str, substr): Get the first occurrence of substring# in the string str The position of ##substr, if not, return -1
• strings.LastIndex(str, substr): Get the string str# The position of the last occurrence of substring substr in ##, if not, return -1##strings.Replace(str, old, new, n)
: Replace the first
• n old in the string str with newstrings.Split(str, sep)
: Split the string
• str into slices by sep strings.ToLower(str)
: Convert string to lowercase
• strings.ToUpper(str)
: Convert string to uppercase
• 2. Array and slice operations

The operations of arrays and slices in Golang are also functions we often use. The following are some commonly used array and slice operations:

##len(arr)

: Get the array length

• len(slice): Get the slice length
• cap(slice): Get the slice capacity
• arr[index]: Get the element at the specified index in the array
• slice[index]: Get the element with the specified index in the slice
• slice[start:end]: Intercept the slice
• append(slice, elem): Append elements to the slice
• copy(dest, src): Copy the elements in the source slice
src
• Copy to the target slice dest3. Map operation
The map in Golang is an unordered, key-value pair data structure. The following are some commonly used map operations:

len(map)

: Get the map length

• map[key]: Get the map The value of the specified key in
• delete(map, key): Delete the key-value pair of the specified key from the map
• for key, value := range map: Traverse all key-value pairs in the map
• 4. File operations
File operations are also very common in development, and Golang also has some built-in file operations Methods. The following are some commonly used file operations:

os.Create(name)

: Create a new file

• os.Open(name): Open the file
• os.OpenFile(name, flag, perm): Open the file with the specified flag and mode
• defer file.Close() : Close the file at the end of the function
• bufio.NewReader(file) : Create a file cache reader
• io.Copy(dest, src ): Copy the content of the source file to the target file
• ioutil.ReadFile(filename): Read the file content as a byte array
• 5. Time and date operations
In many development scenarios, we need to operate on time. Golang also provides a series of time and date operation methods. The following are some commonly used time and date operations:

##time.Now()

: Get the current time

• time.Time.Format( layout string): Convert time into a string according to the specified format string
• time.Parse(layout, value): Parse the given string according to the specified format For time
• time.Duration.Seconds(): Get the number of seconds of the duration
• time.Duration.Minutes(): Get the duration Minutes of time
• The above are some commonly used Golang methods. These methods involve some core features in Golang. Mastering these methods can help developers cope with various development scenarios more easily.

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