var var1 = "Test 1";
var var2;
var var3 = var1 || "Value of var3"; // use "Value of var3" value if var1 doesnt has value
console.log(var3);
var var4 = var2 || "Value of var4"; // use "Value of var4" value if var2 doesnt has value
console.log(var4);
var var5 = var2 || var3 || "Value of var5"; // use "Value of var5" value if var2 or var3 doesnt has value
console.log(var5);
var var6 = 1;
var var7 = var6 || "var7";
console.log(var7);