JavaScript Array concat
RenketsuDataArr = undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined
RenketsuDataArr.length = 0
Data1Arr = 1,2,3,4,undefined,undefined,undefined,undefined
Data1Arr.length = 4
Data2Arr = 10,20,30,40,undefined,undefined,undefined,undefined
Data2Arr.length = 4
RenketsuDataArr = 1,2,3,4,10,20,30,40
RenketsuDataArr.length = 8
Data1Arr = 1,2,3,4,undefined,undefined,undefined,undefined
Data1Arr.length = 4
Data2Arr = 10,20,30,40,undefined,undefined,undefined,undefined
Data2Arr.length = 4