It wasn’t the if-

04/10/23 www.vsmerlot.com 1

The Model is the Code

Using COSA Technology

Gordon Morrison

It wasn’t the “go to”

• The ‘if’ has caused more spaghetti code than the ‘go to’ ever could.

Simple Calculator Example

• Subtract two negative numbers resulting in a negative result.

A COSA Solution

• Rules– Operand1– Operate– Operand2– Result– Done– Error

The Application

• Five Functions– Add– Subtract– Multiply– Divide– Percent

• Clear• Clear Entry

On Subtract Event

• Handled as Negate

Run Engine

Engine On

Check Event State

• Static State– Compared to

• Dynamic State

True Rule or Behavior

• Dynamically bind to True Member

Operand1 Rule

• Step– Negate

Rule’s True Behavior

Single Point True Trace

Trace what you want

• Complex or• Simple

Next Rule

• Base on True

Engine Off

• Return to OS…

Exit to OS

• Model = Code• Code = Model

Application

Next On Click Event

Back to Engine

Same Rule Next Step

• Previous Step Allows– True Any Number– False One Period

True Behavior

Turn Engine Off

Next True Step

Engine Off

Return to OS

Rule Operand1 Step Any Number

• Model = Code• Code = Model

Number

Now Click Subtract

Subtract

• On Click Event

Not Any Number

• Next Step

Not Any Number

• Next Step

Not Clear Entry

Not Clear

Rule Operate

• Not Step Addition

Not Addition Step

• Rule Operate

Rule Operate

• Step Subtract

Rule Operate

• Step Subtraction

Next Rule

• Operand 2

First Step

• Return to OS

Subtracting

Rule Operand2

• Step Negate

A Negative Number

Then Click Equals

On Click Equals

Not Any Number Step

Exit Rule Operand 2

Not Clear Entry

• Etc.

Result Rule

• Not Percent Step

Result Rule

• Equals Step

Result

It wasn’t the if-

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