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State

State is where a smart contract works with saving and retrieving data.

You can think of it much like a database interaction layer in a traditional application.

A contract is instantiated as defined in state.rs.

State declared - State.rs​

This is an example of TokenInfo being declared. 

#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
#[serde(rename_all = "snake_case")]
pub struct TokenInfo {
  pub name: String,
  pub symbol: String,
  pub decimals: u8,
  pub total_supply: Uint128,
  pub mint: Option<MinterData>,
}

State initialised​

Then the storage is initialized:

pub const TOKEN_INFO: Item<TokenInfo> = Item::new("token_info");

Contract.rs​

Here is an example of the instantiate function saving data.

let data = TokenInfo {
name: msg.name,
symbol: msg.symbol,
decimals: msg.decimals,
total_supply,
mint,
};
TOKEN_INFO.save(deps.storage, & data) ?;