ZML Objects can have one of five types:
You can initialize variables in ZML with the assigned or capture tags.
Common strings are user properties like
Declare a string by wrapping a variable’s value in single or double quotes:
Numbers include floats and integers. Common numbers are user properties like
loyalty_points. When assigning a number to a variable, do not wrap the number in quotes or it will be considered a string.
Booleans are either
false. No quotations are necessary when declaring a boolean:
Nil is a special empty value that is returned when the ZML code has no results. It is not a string with the characters “nil”.
Nil is treated as false in the conditions of
if blocks and other ZML tags that check the truthfulness of a statement. In the following example, if the user property
first_name does not exist (that is, first_name returns
nil), ZML will not print the greeting:
Tags or outputs that return
nil will not print anything to the content.
To access all the items in an array, you can loop through each item in the array using an iteration tag.
Accessing Specific Items in Arrays
You can use the square bracket
] notation to access a specific item in an array. Array indexing starts at zero.
You cannot initialize arrays using only ZML. You can, however, use the split filter to break a string into an array of substrings.