Pair Programming Exercises

pair_programming_exercises.md

Number to Ordinal

Finish the function numberToOrdinal, which should take a number and return it as a string with the correct ordinal indicator suffix (in English). That is:

• numberToOrdinal(1) ==> '1st'
• numberToOrdinal(2) ==> '2nd'
• numberToOrdinal(3) ==> '3rd'
• numberToOrdinal(4) ==> '4th'

Fluid Calculator

The goal is to implement simple calculator which uses fluent syntax (pseudo code)

• Calc.new.one.plus.two # Should return 3
• Calc.new.five.minus.six # Should return -1
• Calc.new.seven.times.two # Should return 14
• Calc.new.nine.divided_by.three # Should return 3

In js

• new Calc().one().plus().two()

String to Number

V1 I'd like an efficient function that can convert a single character string (or just a char if the language supports this type) to an int:

• parse("1") # 1
• parse("d") # doesn't work
• etc...

V2 Can we improve this by supporting multi characters:

• parse("23") # 23
• parse("dd") # doesn't work

V3 Also support negative numbers:

• parse("-23") # -23
• parse("-dd") # doesn't work

V4 Now what about supporting floats:

• parse("23.43") # 23.43
• parse("dd.dd") # still doesn't work