How does JS simplify such a cycle

JavaScript
the following code, except for the different conditions of judgment, is the same in the loop. The judgment condition may contain I , or it may not contain I . Is there any way to simplify them? 

// obj json
loop1(){
    for(let i=0;i<obj.length;iPP){
        if(i%2!==0){
            doSomethingA()
        } else {
            doSomethingB()
        }
    }
}
loop2(){
    for(let i=0;i<obj.length;iPP){
        if(i%2!==0 && i!==0){
            doSomethingA()
        } else {
            doSomethingB()
        }
    }
}
loop3()
loop4()
Javascript
Mar.16,2021 
// obj = xxxx

function loop (predicate) {
    for (let i = 0; i < obj.length; iPP) {
        if (predicate(i)) {
            doSomethingA()
        } else {
            doSomethingB()
        }
    }
}

loop(i => i % 2 !== 0)
loop(i => i % 2 !== 0 && i !== 0)



let loop = (fun) => {<br>  obj.forEach((v, k) => {


if (fun) {
} else {
}


}) 
} 
 loop (fun)

Previous: The problem of variables in for Loop in promise,then and catch

Next: Ask for help on svg question

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-64f5-1bf4556-4647c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf4556-4647c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?