it is a common misconception around the web, CONST
doesn’t creates immutable variables instead it creates immutable binding.
eg.
const temp1 = 1;
temp1 = 2 //error thrown here.
But
temp1.temp = 3 // no error here. Valid JS code as per ES6
so const
creates a binding to that particular object. const assures that variable temp1
won’t have any other object’s Binding.
Now coming to Object
. we can get immutable feature with Object
by using Object.freeze
const temp3 = Object.freeze( {a:3,b:4})
temp3.a = 2 // it wont update the value of a, it still have 3
temp3.c = 6 // still valid but wont change the object