WuttyiControl Flows
In computer science, control flow (or flow of control) is the order in which individual statements, instructions or function calls of an imperative program are executed or evaluated. The emphasis on explicit control flow distinguishes an imperative programming language from a declarative programming language.
if
Don't miss out the <alternate> aka else branch in single expression statement.
Syntax
(if <test>
<sequence>
<alternate>
)
lisp
(var isTrue true)
(if (not isTrue)
(print "True")
(print "False")
)
Output
shell
False
if and block
Multiple expressions must be written in the block.
lisp
(var isAuth true)
(if isAuth
(begin
(var name "Ma Ma")
(print (+ name " is logged in"))
)
(begin
(print "Auth Failed ðŸ˜")
)
)
Output
shell
Ma Ma is logged in
Switch (or) Match
Syntax
(<switch|match) <block1>
<block2>
...
<block_n>
<else_block>
)
(<switch|match) (<cond1> <result1>)
(<cond2> <result2>)
...
(<cond_n><result_n>)
(else <result>)
)
Example
lisp
(var x 10)
(switch ((= x 10) (print "x is 100))
((= x 20) (print "x is 200))
(else (print "Nothing"))
)
Output
shell
x is 100
while loop
Syntax
(while <test>
(begin
<increase_counter>
)
)
Example
lisp
(var counter 0)
(var limit 100)
(var result 0)
(while (< counter 100)
(begin
(set counter (+ counter 1))
(set result (+ result 1))
)
)
(print result)
Output
shell
100
For Loop
Syntax
(for <init> <test> <increment>
<block|expr>
)
Example
Default
lisp
(var sum 0)
(for
(var i 0)
(< i 100)
(set i (+ i 1))
(set sum (+ sum i))
)
(print sum)
Syntactic Sugar
lisp
// for loop (sugar)
(var sum 0)
(for
(var i 0)
(< i 100)
(++ i)
(+= sum i)
)
(print sum)
Output
shell
4950