Xcode - "Cannot assign to the result of this expression"?

Hi there

The '=' sign when used in programming, assigns the value on the right, to the left of the expression

We can say something like

var yourName = "Mustafa Kasim"

Here, the computer automatically understands that the variable 'yourName' should be of a string datatype, based on the value I assigned to it on the right

But, as the programmer, you can let the computer know that your value will definitely be a string by mentioning it in your code like

var yourName:String = "Mustafa Kasim"

By putting the ':String', you have explicitly told the computer that your variable 'yourName' will be a String datatype. And then, you assign it the value

When you did an "var str = String = "Hello". You had a typo before the datatype. And the computer doesn't know what '= String' should do, so it throws an error and doesn't execute. Change it to

var str : String = "Hello" 

That will ask a variable named 'str' of type 'String' to be created, and assigned a value of "Hello".

Best

var username = "Maher" str = username var Morning = "Hi " str = Morning + username print(Morning + username)