Scripting Guide - SAS

82 JSL Building Blocks Chapter 5
Iterate
Example
What does First() do in the following script?
x = 1000;
First(x, x=2000)
The First function returns the value of x (1000). 2000 is then assigned to x.
Iterate
JSL provides the For(), While(), Summation(), and Product() functions to repeat (or iterate) actions
according to the conditions that you specify.
Note: A similar function called For Each Row() is for iterating actions over rows of a data table. See “If”
on page 87 for an example. “Accessing Values” on page 248 in the “Data Tables” chapter also describes
iterating through table rows.
For
The For() function expects four arguments separated by commas. The first three arguments are rules for
how many times to repeat the loop, and the fourth is what to do each time the loop is executed.
The basic syntax for For() is as follows:
For(initialization, while, iteration, body);
For example, the following script sums the numbers from 0 to 20:
s = 0;
For(i = 0, i