JS Reserved Words 🎯

Welcome to our comprehensive guide on JavaScript Reserved Words! In this tutorial, we'll delve into the world of JavaScript, exploring keywords that are off-limits for variable and function names. 📝

What are JavaScript Reserved Words?

JavaScript reserved words are predefined keywords that have special meanings in the language. They cannot be used as variable or function names as they are reserved for specific purposes within JavaScript. 💡

List of JavaScript Reserved Words 📝

Here's a list of JavaScript reserved words. Familiarizing yourself with them will help you avoid naming conflicts and make your code more readable.

javascript

abstract           const            new          switch
arguments           continue          return        this
boolean             break             short          throw
byte                case              super         throw
char                catch              switch        transient
class               charCodeAt        synchronized  true
const               class              symbols       try
debugger             catch              systemId      typeof
definingProperty    catchBinding       systemPrincipal  typeofName
delete               charCodeAtLength   tagName        typeofObject
do                   finally            templatestrings  undefined
double              for                 template     unicode
else                function           this             unreachable
enum                  goto               throw             unsigned
eval                 if                throwException  union
export               imports             transient      unsubscriptable
extends              in                 true            unsafe
finally              instanceof         try             unwatch
final                  int                 typeof         use
float                interface          typeof         var
for                  let                typeofName     void
function              long               typeofObject   volatile
get                  native             umlaut         wait
goto                 null                undefined      while
implements           package             unlimited      with
import               private            unpack         yield
in                   protected          unprototype     __proto__
instanceof           public             unshift        __hasInstance
interface             return             unionType      __defineGetter__
let                  short               unique         __defineSetter__
link                 static              unwatch         __lookupGetter__
long                 staticGet           unrestricted   __lookupSetter__
native               super               unsynchronized  __lookupWith__
new                  switch              unwrap          __proto__get__
number               synchronized        upvar          __proto__hasProperty__
package               throw               usage          __proto__isPrototypeOf__
private               throwException      var             __proto__set__
protected              true               volatile        __proto__toLocaleString__
public                  try                 with            __proto__valueOf__
static                  typeOf              x               __proto____

Quiz Time 🎓

Practice Time 🕰️

Now that you've learned about JavaScript reserved words, let's put your knowledge into practice!

Try renaming the following variables and functions so they don't conflict with reserved words:

javascript

const class = "student";
function if(num) {
  //...
}

Solution

javascript

const className = "student";
function checkNum(num) {
  //...
}

In the first example, we've renamed the variable class to className to avoid naming conflicts with the reserved word class. In the second example, we've renamed the function if to checkNum because the keyword if is reserved in JavaScript. 💡

Wrapping Up 🎁

By understanding JavaScript reserved words, you can write cleaner, more efficient, and easier-to-read code. In this tutorial, we covered the list of reserved words in JavaScript, along with practical examples and a quiz to test your understanding. Happy coding! 💡💻