java/lesson3-4.html at master · avtohem/java · GitHub

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<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Getting Started wiht JAVA Script</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
  </head>
  <body>


    <script>
      //String
      'this is my string';
      'my second string';
      "else one string";

      console.log(Boolean(''));
      //objects - like dictionary in Python
      const user = {
        name: 'Chris',
        username: 'chriscode'
      };
      //array - like list in Python
      const users = ['chris', 'nick', 'holly'];

      //something heavy

      const superUser = [
        {name: "name Zero"},
        {name: "name One"},
        {name: "name Two"}
      ]

      console.log(users[0]);
      console.log(superUser[1]['name']);

      //declaring variables

      var thing = 'first'; // depricated for the future
      const otherThing = 'second'; //it could not be reassigned
      let newThing = 'third'

      newThing = "New value for let declared variable"

      const a = 10;
      b = 3;
      c = 15;
      e = 'my name'
      d = 'Alx'
      console.groupCollapsed("SomeGroup");
          console.log(a+b);
          console.log(e + ' ' + d);
          console.log(typeof(a+d))
      console.groupEnd();

      const x = 'one';
      const y = 'one';
      const z = 'ONE'

      let numb = 10;
      let str = '10';

      let smth;
      let the = null;

      console.groupCollapsed('Comparisions')
        console.log(x == y);
        console.log(x == z);
        console.log(x == z.toLowerCase());
      console.groupEnd();

      console.groupCollapsed('compare string and number');
        console.log(numb == str);
        console.log(numb === str);
        console.log(numb != str);
        console.log(numb !== str);
      console.groupEnd();

      console.groupCollapsed('undefined');
        console.log(smth == the);

      console.groupEnd();

    </script>

  </body>
</html>