Description - Mks.com

If expression is a vector, the value is the number of elements in the vector. If expression is a string,
the value is the number of characters in the string; otherwise, the value is 0.
String/Vector Operators
The operator | concatenates strings or vectors. The form is
expression1 | expression2
where expression1 must be a string or vector. If expression1 is a string, the second argument is
converted to a string and the two strings are concatenated for the result. For example, in
X = "hello";
X = X | " good" | "bye";
the variable X is assigned the value
"hello goodbye"
You can use the shorthand notation |= to append to the end of an existing string, as in
x = "hello";
x |= " good" | "bye";
which has the same result.
If the first argument of the | operator is a vector, the second argument is added as a new
component to the vector. In this way, you can assign values to a vector incrementally. You can use
the |= operator as a shorthand assignment. For example:
x = {} # ensure x is a vector
x |= 1; # x is now { 1 }
x |= "so"; # x is now { 1, "so" }
x |= 2 | 3; # x is now { 1, "so", "23" }
# Remember, the '|' is applied to '2' and '3',
# forming a string, that is then added
x |= { 4, 5 }; # x is now { 1, "so", "23", 4, 5 }
Assignments
There are several assignment expressions.
name = expression ;
318 of 457