java/lesson8_builtIN.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/3.3.7/css/bootstrap.min.css">
  </head>
  <body>


    <script>

    const first = 'this is a string';
    const second = String('this is a string')

    console.log('smallstring'.toUpperCase());

    console.groupCollapsed("PrimitivesToObjects");
      console.log(first === second);
      console.log(
        typeof first,
        typeof String('this is a string'),
        typeof new String()
      );
    console. groupEnd();
    const sentense = 'this is my sentence';

    console.groupCollapsed('String')
      console.log(first.toUpperCase());
      console.log(second.toLowerCase());
      console.log(sentense.startsWith('this is'));
      console.log('B'.repeat(5));
    console.groupEnd();


    console.groupCollapsed('Numbers');
      console.log((1).toString());
      console.log(1..toString());
      console.log(Number.isInteger(5));
      console.log(Number.isInteger(5.4));
      console.log(1.5467);
      console.log((1.5467).toFixed(2));
      console.log(
        Math.random(),
        Math.ceil(4.56),
        Math.floor(4.56)
      );
    console.groupEnd();

    const myArr = ['chris', 'nick', 'holly'];

    console.group("Arrays");
      console.log(myArr.length);
      console.log(myArr.join('-'));
      console.log(myArr.push('ado'), myArr);
      console.log(myArr.pop('ado'), myArr);
      myArr.forEach((user) => console.log(user));
    console.groupEnd();
    </script>

  </body>
</html>