Day 032 - String Operators
As well as the Arithmetic Operator '+' it's also possible to use as a string operator to concatenate strings together.
Inspecting the code for various demos, you'll see code such as:
'true && true' + ' = ' + and1 + '<br/>'
In this instance, the result concatenates the strings, so everything wrapped in '' will be output, notice that and1 isn't wrapped in '' therefore it's not a string, in this case it will return the value of the variable.