//function to get latest ABno;
//function will return distinct latest version from an array of strings in the format 'ABxxx-vx',
//where AB is the starting of the string,
//xxx represents the number followed by AB,
//-vx respresents the version and x at the end is the version number

var ABNOLatest = function(ABarray){
	ABarray = ABarray.sort();
    //console.log(ABarray);
    var baseAB;
    var PrevAB = {};
    var maxver;
    var finalABList=[];
    ABarray.map(function(AB){
        var ABsplit = AB.split("-");
        if(ABsplit.length>1) maxver=parseInt(ABsplit[1].replace('V',''));
        else maxver=0;

        baseAB = ABsplit[0];
        //console.log(PrevAB,baseAB,maxver);
		//conditionals to check and update list of latest ABNo
        if(Object.keys(PrevAB).length === 0 && PrevAB.constructor === Object){  //checks whether object is empty or not
            //console.log("if loop");
            PrevAB.baseAB = baseAB;
            PrevAB.ver = maxver;
			PrevAB.AB=AB;
            finalABList.push(PrevAB.AB) //Initial push to finallist array
            //console.log(PrevAB);
        }
        else if(PrevAB.baseAB==baseAB){
            //console.log("else if loop ==> baseAB");
            finalABList[finalABList.length-1] = (PrevAB.ver<maxver? AB:PrevAB.AB); //sets Last ABNo based on version number
            //console.log(finalABList[finalABList.length-1]);
            PrevAB.ver= (PrevAB.ver<maxver? maxver:PrevAB.ver);	//sets version number for Prev.ver
            //console.log("PrevAB.ve",PrevAB.ver);
			PrevAB.AB=AB;
        }
        else if (PrevAB.AB!=undefined && finalABList.indexOf(AB)==-1){//if current ABNo is not in the list
            //console.log("else if loop ==> finalABList");
            finalABList.push(AB);
            //console.log(AB);
            PrevAB.baseAB = baseAB;
            PrevAB.ver = maxver;
			PrevAB.AB=AB;
        }

    });
    console.log('finalABList',finalABList);
	return finalABList;

}

//Following is a sample array that you can use for test.
var POar = ["AB1914411-V3", "AB2583130-V2", "AB2583130", "AB2017312-V3","AB2017312-V20", "AB2017312-V2", "AB1985437-V3", "AB1985437-V2"];
ABNOLatest(POar);