List functions

List functions iterate over a list, check a condition, and return a value. There are several list functions, and each returns a different type of value. These functions are:

listCount

The listCount function iterates over a list and evaluates a logical statement for each list iteration. listCount returns the count of the number of iterations which evaluate to "true."

listSum

The listSum function iterates over a list and a field reference. The function returns the sum of the referenced survey fields.

listWhich

The listWhich function iterates over a list and a logical statement. Each iteration evaluates the logical statement with a list substitution. listWhich returns either the first iteration that evaluates to true, or optionally all iterations that evaluate to true. The values returned can be list id, text, or other related data.

listUnique

The listUnique function iterates over a list and a field reference, checking whether each row-question in a table contains a distinct response. This function is particularly helpful for verifying that text inputs and autoothers do not contain identical responses.

listMax

The listMax function iterates over a list and evaluates a statement for each list iteration. listMax returns the result of the statement which evaluated to the largest value.

listMin

The listMin function iterates over a list and evaluates a statement for each list iteration. listMin returns the result of the statement which evaluated to the smallest value.

listVar

The listVar function iterates over a list and evaluates a statement for each list iteration. listVar returns the variance of all evaluated statements.

listProduct

The listProduct function iterates over a list and evaluates a statement for each list iteration. listProduct returns the product of the evaluated statements.