2023-05-07 javascript

When we define funtion, if we do not write 'return statement', then function returns 'undefined' value.

 

We can assign some values to parameters.

function introduce(name, age, nationality='South Korea'){

}

We call these parameters as optional parameters. Optional parameters should be defined last like the example.

 

We should define constant variable like this const MY_NUM = 1;

 

We can select same codes by typing control + D

 

The type of variables matters when we compare values in switch statement.

We should use === when we compare values in if statement.

 

In switch statement, we don't need ( ) after 'case' like this case 1

We don't need break; in default :