New PDF release: A Mentoring Course on Smalltalk

By Andrés Valloud

A developer consistently seeks larger knowing of software program engineering and layout. occasionally success intervenes and a mentor is helping to enhance one's skills. besides the fact that, there are just such a lot of of those infrequent encounters, and hence, now not everyone seems to be afforded such possibilities. This e-book makes an attempt to take away success as a restricting issue for one's expert progress in Smalltalk by means of disseminating fabric realized over numerous years of mentoring.

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20 [10] Is aLargeInteger negated always a large integer? 21 [10] Is the sum of small integers always a small integer? 22 [10] Is the sum of large integers always a large integer? 23 [26] Take a look at the following test method. testExample self shouldnt: [SomeClass new performAction] raise: ActionException The intention of shouldnt:raise: is to fail if evaluating the block raises the exception given. This means that if performAction is not implemented, this test will pass because the exception corresponding to a message not being understood is not ActionException.

There is one option left to consider: to place the keyword message between all the comma messages. This may seem strange, yet the method below seems quite reasonable. hasAllProperties ^[self hasPropertyA] andAllOf: [self hasPropertyB], [self hasPropertyC] Note that it is quite advantageous to specify two logical connectors. The first connector applies between the receiver and the argument (andAllOf:), and the second connector applies between the conditions of the argument (andAllOf:). This suggests the following family of keyword messages.

This means that if performAction is not implemented, this test will pass because the exception corresponding to a message not being understood is not ActionException. What, if anything, is wrong with this? 22 CHAPTER 1. IT’S ALL IN A NAME Live Smalltalk exercises Solving these exercises will definitely require a computer. Give them your best effort before looking at the solutions. 24 [31] In Classic releases of ObjectStudio Smalltalk (those prior to its inclusion in VisualWorks), some messages have no source code.

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A Mentoring Course on Smalltalk by Andrés Valloud


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