It is a concurrent and secure Map type provided by the Golang standard library. It can be locked in multiple goroutine concurrent reading and writing Map scenarios. The two most typical usage scenarios:
- Write less and read more scenes, especially scenes that only write once and read multiple times, such as cache;
- When multiple programs read, write and modify scenarios.
The following methods are provided:
- Store(key, value any): Store key-value pairs in the Map
- Load(key any): Get the value according to the key
- Delete(key any): Delete key-value pairs
- LoadAndDelete(key any): Get and delete key-value pairs
- LoadOrStore(key, value any): If the key already exists, return the corresponding value. If it does not exist, store the key-value pair.
- Range(f func(key, value any) bool): traverse key-value pairs in the map
How to use and examples
package main
import (
"fmt"
"sync"
)
func main() {
var m
// Store key-value pairs ("key", "value")
// Get the value according to the key val, ok := ("key")
if ok {
(val)
}
// Iterate through all key-value pairs (func(k, v interface{}) bool {
("key:", k, ",value:", v)
return true
})
// Delete key-value pairs ("key")
}summary
It is a very practical and powerful synchronization tool in Golang. It can be used to implement concurrent and secure Map data structures, which can improve the reliability and performance of the program in concurrent access scenarios.
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