rustHow can I use a hashmap as a global variable in Rust?

A global variable in Rust can be implemented using a static variable. A static variable is a variable that is stored in the program's read-only memory and is accessible from any part of the program.

A static variable can be used to store a HashMap as a global variable. The following example code creates a static variable GLOBAL_MAP that stores a HashMap with a String key and i32 value:

static GLOBAL_MAP: HashMap<String, i32> = HashMap::new();

Code explanation

• static: A keyword used to declare a static variable.
• GLOBAL_MAP: The name of the static variable.
• HashMap<String, i32>: The type of the static variable, a HashMap with a String key and i32 value.
• HashMap::new(): A function that creates a new empty HashMap.

Helpful links

• Rust Book - Variables
• Rust Book - HashMap

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