While and Do/While Constructs
You can also use the While or Do/While constructs, which act like the argumentless For in that they repeat sections of code, and terminate based on a condition. They only differ in whether the condition is evaluated before the entire code block (While) or after (Do/While). You can also use Quit, Return, and Continue with conditions inside the code block just as you can with For. Here is the syntax of the constructs:
do {code} while (condition)
while (condition) {code}
Examples of these constructs:
VS Code - ObjectScript
/// examples for ObjectScript Tutorial
Class ObjectScript.Examples
{
/// generate Fibonacci sequences
ClassMethod Fibonacci()
{
read !, "Generate Fibonacci sequence up to where? ", upto
set t1 = 1, t2 = 1, fib = 1
write !
do {
write fib, " "
set fib = t1 + t2, t1 = t2, t2 = fib
}
while (fib '> upto)
set t1 = 1, t2 = 1, fib = 1
write !
while (fib '> upto) {
write fib, " "
set fib = t1 + t2, t1 = t2, t2 = fib
}
}
}
Testing using the Terminal
USER>do ##class(ObjectScript.Examples).Fibonacci()
Generate Fibonacci sequence up to where? 100
1 2 3 5 8 13 21 34 55 89
1 2 3 5 8 13 21 34 55 89
USER>