hello-world-mina.ts

import {
  Field,
  SmartContract,
  state,
  State,
  method,
} from 'snarkyjs';


export class Square extends SmartContract {
    @state(Field) num = State<Field>();
    
    
    init() {
        super.init();
        this.num.set( Field( 3 ) );
    }


    @method update( square: Field ) {
        const currentState = this.num.get();
        this.num.assertEquals( currentState );
        square.assertEquals( currentState.mul( currentState ) );
        this.num.set( square );
    }
}