Test-Driven Development in Javascript

The Four Rules of Simple Design:

• (purge lint violations)

• Passes the tests

• Reveals intention

• No duplication

• Fewest elements

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The Transformation Priority Premise:

({} —-> null) no code at all->code that employs null

(null —-> constant)

(constant —-> constant+) a simple constant to a more complex constant

(constant —-> variable) replacing a constant with a variable or an argument

(statement —-> statements) adding more unconditional statements.

(unconditional —-> if) splitting the execution path

(variable —-> array)

(array —-> container)

(statement —-> recursion)

(if —-> while)

(expression —-> function) replacing an expression with a function or algorithm

(variable —-> assignment) replacing the value of a variable.

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