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(statement) (syntax structure) (command) .

Hello, world! alert('Hello, world!') .

. , .

'Hello World alert .

alert('Hello'); alert('World');

alert('Hello');
alert('World');

(semicolon) .

alert('Hello')
alert('World')

, . ' ' .

alert(3 +
1
+ 2);

6 . "+" , ' . .

, .

[1, 2].forEach(alert)

[] forEach , . . 1 2 .

alert .

alert(" .")

[1, 2].forEach(alert)

alert .

alert(" .");

[1, 2].forEach(alert)

. 1 2 .

[...] .

. .

alert(" .")[1, 2].forEach(alert)

. . .

, . . . . . .

. (comment) .

. .

// .

. .

//      .
alert('Hello');

alert('World'); //     .

/* */ .

/*    
   .
*/
alert('Hello');
alert('World');

. /* */ .

/*   
alert('Hello');
*/
alert('World');

. . Ctrl+/ , Ctrl+Shift+/ . Mac Ctrl Cmd, Shift Option .

/*...*/ /*...*/ .

/*
  /*   ?!? */
*/
alert( 'World' );

. . , . , .