Javascript Reserved Words
JavaScript has a number of reserved keywords. These are the words that we cannot use as identifiers (variable names, function names, and loop labels) in our JavaScript programs.
Reserved keywords in ECMAScript 5
The following list shows the keywords that are reserved in ECMAScript 5 and also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode:-
|
arguments |
Enum |
instanceof |
|
break |
Eval |
interface |
|
case |
Export |
let |
|
catch |
Extends |
new |
|
class |
False |
null |
|
const |
finally |
package |
|
continue |
For |
private |
|
debugger |
function |
protected |
|
default |
If |
public |
|
delete |
Implements |
Return |
|
do |
import |
static |
|
else |
In |
super |
Reserved keywords in ECMAScript 6
The following list shows the keywords that are reserved in ECMAScript 6 and also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.
|
arguments |
else |
in |
|
await |
Enum |
instanceof |
|
break |
eval |
interface |
|
case |
export |
let |
|
catch |
extends |
new |
|
class |
false |
null |
|
const |
finally |
package |
|
continue |
for |
private |
|
debugger |
function |
protected |
|
default |
if |
public |
|
delete |
implements |
return |
|
do |
import |
static |
Future Reserved keywords in Older Standards
The following list shows the keywords that were reserved as future keywords by the older specifications (before ECMAScript 5 or ES5).
|
abstract |
int |
|
boolean |
long |
|
byte |
native |
|
char |
short |
|
double |
synchronized |
|
final |
throws |
|
float |
transient |
|
goto |
volatile |
