var userInfo= ["John",31, 1987, "frontend developer", "blue", false];
userInfo[userInfo.length] = "deneme ";//add array to the end
userInfo.push("@we212");//add array to the end
userInfo.unshift("mr");//add array to begenning
userInfo.pop();//remove at the end of array
userInfo.shift();//remove at the first of array
document.getElementById("goal").innerHTML += userInfo;
document.getElementById("goal").innerHTML += userInfo.indexOf(1987);// this array is in the nth array
document.getElementById("goal").innerHTML += userInfo.indexOf("yasemin");// this array is in exist => result is -1
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