How to merge two function into one function

how do two merge into one?
function rightClick () {

    
    index -= imgCount;
    
    
    if(index < 0)
    {
        index = 0;
        return;
    
    }
    document.getElementById("img1").setAttribute("src", imgs[(index)%3]);
    document.getElementById("img2").setAttribute("src", imgs[(index + 1)%3]);
    document.getElementById("img3").setAttribute("src", imgs[(index+2)%3]);
}
function leftClick(){
    index += imgCount;
    if(index > imgs.length){
        index = imgs.length;
        return;
    }
    document.getElementById("img1").setAttribute("src", imgs[(index)%3]);
    document.getElementById("img2").setAttribute("src", imgs[(index +1)%3]);
    document.getElementById("img3").setAttribute("src", imgs[(index+2)%3]);
    
}
Javascript
Mar.01,2021

conditional judgment 

function leftClick(){   //  event 
    if(){
     //
    }
    if(){
     //
    }
    document.getElementById("img1").setAttribute('src', imgs[(index)%3]);
    document.getElementById("img2").setAttribute('src', imgs[(index +1)%3]);
    document.getElementById("img3").setAttribute('src', imgs[(index+2)%3]);
    
}
/**
 * type leftright
 * 
 * @param {any} type 
 * @returns 
 */
function setImage(type){
    if(type=='left'){
        index += imgCount;
        if (index > imgs.length) {
            index = imgs.length;
            return;
        }
    }else if(type=='right'){
        index -= imgCount;
        if (index < 0) {
            index = 0;
            return;
        }
    }
    document.getElementById("img1").setAttribute('src', imgs[(index) % 3]);
    document.getElementById("img2").setAttribute('src', imgs[(index + 1) % 3]);
    document.getElementById("img3").setAttribute('src', imgs[(index + 2) % 3]);
}

setImage ('left') or setImage (' right')

function, you can add parameters. Hhh found that after this point, many methods can be integrated into a function (of course, the premise is based on business division)
in which your two click actually do the same thing. You can pass a reference to whether the tag is leftClick or rightClick.
in the call time. In summary: 

function click(flag){
    // flag1leftClick
    if (flag) {
        index += imgCount;
        if(index > imgs.length){
            index = imgs.length;
            return;
        }
    }else{     // flag0rightClick
       index -= imgCount;
        if(index < 0)
        {
            index = 0;
            return;
        } 
    }
    document.getElementById("img1").setAttribute('src', imgs[(index)%3]);
    document.getElementById("img2").setAttribute('src', imgs[(index +1)%3]);
    document.getElementById("img3").setAttribute('src', imgs[(index+2)%3]); 
}

Previous: Some questions about internationalization in vue

Next: On the problem of grabbing web page content by PYTHON

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-64f5-1b3c2dc-4087d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3c2dc-4087d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?