Pipe Operator

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);