is_number

Test if a value is a number (integer or floating point):

{% if 1|is_number %}Yes, this is a number{% endif %}

Test if an integer value is even:

Test whether a survey respondent may return to the previous page in a history.

Check if the given survey is configured to save intermediate results. Always returns a boolean value.

Provide an alternative value in case a value is undefined.

Provide an alternative value in case a value is undefined.

Check if a list of questions contains a pagebreak block with an unconditional submit.

Selects an argument depending on a condition.

Tests if the value is a date and equal to the argument. The value and the argument must be a tuple of the format {Y,M,D} or {{Y,M,D},{H,I

Test if a value is a list:

Type at least two characters