block1.js

const Sequelize = require('sequelize')
const db = new Sequelize('db', 'user', 'pass', {
	dialect: 'postgres'
})

const User = db.define('users', {
	// line A
	name: Sequelize.STRING,
	age: Sequelize.INTEGER,
	city: Sequelize.STRING,
	isAdmin: {type: Sequelize.BOOLEAN, defaultValue: false}
})

db.sync().then(() => {
	User.create({
		// line B
		name: 'Arnav', age: 23, city: 'Delhi', isAdmin: true
	}).then(user => {
		// line C
		console.log(user.age) // 23
	})
})