[rookie] the problem that js judgment is not equal to two values

Can

be abbreviated in this way? I feel very bloated 

if(a===1 || a===2}{}
Javascript
Sep.07,2021
< H2 > [1,2] .some (_ = > _ = a) like this? < / H2 >

updated
someone seems to have stepped on this answer yesterday, although I don't know why. So say more, for the conditional judgment logic of the listing code of the landlord, using logic or operator is already very good. In fact, if I write in this way, it is just a different way of writing. Similar can also be simulated by bit operators, regularities, and so on.

if you really want to kill if-else , you need to solve the problem at the abstract level, such as using policy patterns, but is it really suitable to shoot mosquitoes with cannons for simple business logic descriptions?

this kind of problem generally requires business process optimization

if there are many conditions, you might as well use switch

. 
switch(a){
    case 1:
    case 2:
        dosomething1();
        break;
    case 3:
        dosomething2();
        break;
    default:
        doelse();
        break;
}

[1,2] .room( a)

try this 

if(/^(1|2)$/.test(a)) {...}
if(/^[12]$/.test(a)) {...}
if([1,2].includes(a)) {...}

RegExp.test () it doesn't matter if the parameter is a number, it's the same operation as a string

Previous: On the global introduction of components by Mini Program

Next: Css square inner fillet plus shadow

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3f675-2c481.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3f675-2c481.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?