Fetching class from array of circles created using javascript - 


var a1 = linegroup.selectall("circle")[0]; // gives array of circles //here code not working: var a1 = linegroup.selectall("circle")[0];  function classarray() {    return linegroup.select("circle").attr("class"); } var = a1.map(classarray);

following array of circles get: 

[<circle cx=​"74" cy=​"425.5" r=​"8" class=​"limited circlesmall preliteracy">​</circle>​, <circle cx=​"108" cy=​"368" r=​"8" class=​"intermediate circlesmall earlywriting">​</circle>​, <circle cx=​"142" cy=​"273.7" r=​"8" class=​"advanced circlesmall preliteracy">​</circle>​, <circle cx=​"346" cy=​"391" r=​"8" class=​"basic circlesmall writing">​</circle>​, <circle cx=​"380" cy=​"460" r=​"8" class=​"limited circlesmall preliteracy">​</circle>​, <circle cx=​"380" cy=​"172.5" r=​"8" class=​"basic circlesmall reading">​</circle>​, <circle cx=​"414" cy=​"151.79999999999998" r=​"8" class=​"basic circlesmall reading">​</circle>​, <circle cx=​"448" cy=​"105.8" r=​"8" class=​"intermediate circlesmall reading">​</circle>​, <circle cx=​"482" cy=​"96.59999999999998" r=​"8" class=​"intermediate circlesmall reading">​</circle>​, <circle cx=​"516" cy=​"80.50000000000001" r=​"8" class=​"high circlesmall reading">​</circle>​]

my doubt is, how check if class name preliteracy, reading, high, intermediate, writing, earlywriting (i.e.last value of classes)? how class name in different array?


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