javascript

Javascript return object from one file to another file, include class javascript

In Javascript, to include a class, constant or definition from one file to another we need to use exports. exports and module.exports are pointing to the same object, so sometimes you can see both styles. 

class Employee {
  constructor(name, age, email) {
    this.name = name;
    this.age = age;
    this.email = email;
  }

  getStats() {
    return `
      Name: ${this.name}
      Age: ${this.age}
      Email: ${this.email}
    `;
  }
}

module.exports = Employee;
var Employee = require('../models/employee');

Employee employee = new Employee('Robin hood', 1000, '[email protected]');
var Employee = require('./models/employee');

Employee employee = new Employee('Robin hood', 1000, '[email protected]');
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Loop thought object Javascript

const states = {
        "AL": "Alabama",
        "AK": "Alaska",
        "AS": "American Samoa",
        "AZ": "Arizona",
        "AR": "Arkansas",
        "CA": "California"
};
const entries = Object.entries(states);
for (const [abbr, name] of entries) {  
  console.log(`abbr: ${abbr}, name: ${name}`);
}
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List of USA states in Javascript

module.exports = Object.freeze({
    STATES: {
        "AL": "Alabama",
        "AK": "Alaska",
        "AS": "American Samoa",
        "AZ": "Arizona",
        "AR": "Arkansas",
        "CA": "California",
        "CO": "Colorado",
        "CT": "Connecticut",
        "DE": "Delaware",
        "DC": "District Of Columbia",
        "FM": "Federated States Of Micronesia",
        "FL": "Florida",
        "GA": "Georgia",
        "GU": "Guam",
        "HI": "Hawaii",
        "ID": "Idaho",
        "IL": "Illinois",
        "IN": "Indiana",
        "IA": "Iowa",
        "KS": "Kansas",
        "KY": "Kentucky",
        "LA": "Louisiana",
        "ME": "Maine",
        "MH": "Marshall Islands",
        "MD": "Maryland",
        "MA": "Massachusetts",
        "MI": "Michigan",
        "MN": "Minnesota",
        "MS": "Mississippi",
        "MO": "Missouri",
        "MT": "Montana",
        "NE": "Nebraska",
        "NV": "Nevada",
        "NH": "New Hampshire",
        "NJ": "New Jersey",
        "NM": "New Mexico",
        "NY": "New York",
        "NC": "North Carolina",
        "ND": "North Dakota",
        "MP": "Northern Mariana Islands",
        "OH": "Ohio",
        "OK": "Oklahoma",
        "OR": "Oregon",
        "PW": "Palau",
        "PA": "Pennsylvania",
        "PR": "Puerto Rico",
        "RI": "Rhode Island",
        "SC": "South Carolina",
        "SD": "South Dakota",
        "TN": "Tennessee",
        "TX": "Texas",
        "UT": "Utah",
        "VT": "Vermont",
        "VI": "Virgin Islands",
        "VA": "Virginia",
        "WA": "Washington",
        "WV": "West Virginia",
        "WI": "Wisconsin",
        "WY": "Wyoming"
    }
});
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Create express app

express --view=pug myapp

   create : myapp
   create : myapp/package.json
   create : myapp/app.js
   create : myapp/public
   create : myapp/public/javascripts
   create : myapp/public/images
   create : myapp/routes
   create : myapp/routes/index.js
   create : myapp/routes/users.js
   create : myapp/public/stylesheets
   create : myapp/public/stylesheets/style.css
   create : myapp/views
   create : myapp/views/index.pug
   create : myapp/views/layout.pug
   create : myapp/views/error.pug
   create : myapp/bin
   create : myapp/bin/www
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