Empty string: Difference between revisions

=={{header|jq}}==

jq strings are JSON strings. The empty string literal is simply <tt>""</tt>.

If s is a string or an array, then the additive "zero" for s can be created as s[0:0]. That is, if s is a string, then s[0:0] will yield the empty string. This is useful when writing polymorphic functions.

To determine whether a string, s, is empty:<lang jq>s == ""

# or:

s|length == 0

</lang>

To determine whether a string, s, is non-empty:<lang jq>s != ""

# or:

s.length != 0 # etc.</lang>