So I saw a post about a Rails function freeze that caught my attention. I would like to speak on it a bit. So basically, for the uninitiated, The freeze method lets you set an object in rails to be immuttable.

For example:

name = "Robert"
new_name = name

name[0] = T

name       #Tobert
new_name   #Tobert

See, in this instance, we have created a link between the object, name and new_name. Change one and we change the other one.

This is where freeze comes in. If we freeze name: name.freeze then try to change name directly, we get an error. If we change new_name it will not change name.

So if right be the change I add the code:

name.freeze

I’ll get an error message can't modify frozen String: "Robert" (FrozenError)