contract_example.js

class ExampleContract {
    constructor() {
        // define property named "num" in storage.
        LocalContractStorage.defineProperty(this, "num");
    }

    init() {
        // it is implemented just once when contract is deployed.
        // the property defined in contructor can be accessed like this. default "num" value is set as 0.
        this.num = 0;
    }

    // num is saved in "num" property.
    save(num) {
        this.num = num;
        return `${num} is saved`;
    }

    // read the number stored in "num" property.
    read() {
        return this.num;
    }
}
module.exports = ExampleContract;