Inside of 4D write area, the command WR INSERT EXPRESSION is useful for inserting 4D expressions. This includes table fields, variables, statements, and methods. The command saves the reference to the expression, but not the value of the expression. Therefore, if the expression changes its value, if the write document has not been saved, the expressions inserted into the document will be changed once the document is reloaded.

A example of this can be seen below:

1. An expression is declared

C_TEXT(exp1) exp1:="expression1"

2. The value is inserted into a write area

WR INSERT EXPRESSION (area;"exp1")

The result:


3. The value is changed

exp1:="expression2"

4. The write area is reloaded, the write document now looks like