JavaScript Fundamentals

Select the non-primitive type

• symbol

• null

• array

• number

Which type of JavaScript language is

• Assembly-language

• Object-Oriented

• High-level

• Object-Based

Which one of the following symbol is used for creating comments in the javascript

• \\

• //

• \* *\

• \* */

what is the default value of an uninitialized variable?

• 0

• NaN

• null

• undefined

Can be redeclare a variable that is declared with "let" keyword?

• true

• false

JavaScript types are dynamic?

• true

• false

Answer explanation

JavaScript has dynamic types. This means that the same variable can be used to hold different data types

Select the best way to declare a variable

• let MyName = "Walter"

• let MYNAME = "Walter"

• let myName = "Walter"

• let MY_NAME = "Walter"

What method is used to stop a timer?

• stopTimer()

• stopInterval()

• clearInterval()

• stopInterval()

What symbol does the optional chaining operator use? (also know as optional)

• ?

• !

• .

• !!

Answer explanation

Which HTML element is used to put the JavaScript code?

• <scripting>

• <script>

• <javascript>

• <js>