concat#
- swordfish.function.concat()#
If X is a STRING/CHAR scalar
For an empty X,
if Y is an empty STRING/CHAR scalar, the function returns an empty string.
if Y is a non-empty STRING/CHAR scalar, the function returns Y.
Otherwise, the function forms a new string by combining X and Y regardless of whether Y is an empty string or not.
If X is a STRING/CHAR vector
For an empty X, the function returns an empty string.
Otherwise,
if Y is an empty STRING/CHAR scalar, the function concatenates each element in X and returns a string object;
if Y is a non-empty STRING/CHAR scalar, Y serves as the separator between the elements in vector X and the function returns a string object.
备注
The function concat implicitly converts all arguments to STRING type (null values to empty strings) before concatenation.