How to map golang Map

Map is a key-value data structure, also known as a field or associative array. Collections similar to other programming languages

1. Basic syntax

var variable name map[keytype]valuetype

// Make before using map// The map key cannot be repeated. If it is repeated, the last key-value shall prevail// The key-value of map is unorderedvar a map[string]string
a = make(map[string]string, 10)
a["n1"] = "a"
a["n2"] = "b"
a["n3"] = "c"

2. How to use

Declare first, then make

var a map[string]string
a = make(map[string]string, 10)

Declare directly make

a := make(map[string]string, 10)

Declare direct assignment

var a map[string]string = map[string]string{
  "n1" : "Song Jiang"
  "n2" : "Lu Junyi"
}

3. Add, delete, modify and check

a := make(map[string]string, 10)
// If there is no such key, it will be increased, and if there is any, it will be modified.a["n1"] = "aa"
delete(a, "n1")

val, res := a["n1"]

 //Find Res is true, otherwise it is false if res {
  ("Finished")
 } else {
  ("Not arrived")
 }

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