Using assert for debugging Swift 5.1

Personally I don’t use a assert much but you can use it to make sure the value you are getting from a variable is the correct one.

var userName = "Bill"

assert(userName == "Bill", "Wrong Username")

The above code does not have an error so the program will continue but if we change the user name.

var userName = "Jim"

The program will hold on the assert And print the error message you have provided in the function.

Assertion failed: Wrong Username: file ULAssert.playground, line 5