Onionmixer: 정오표 수정

2014-05-09T08:58:34Z

정오표 수정

← Older revision		Revision as of 08:58, 9 May 2014
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	initialIndex		initialIndex
	textEditor		textEditor
	~~bin1`4~~		bin14
	bin14Total		bin14Total
	HouseholdFinances		HouseholdFinances
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	===Assignments===		===Assignments===

	A literal constant will always refer to the same object, but a variable name may refer to different objects at different times. The object referred to by a variable is changed when an assignment expression is evaluated. Assignments were not listed earlier as a type of expression since any expression can become an assignment by including an ~~assign ment~~ prefix.		A literal constant will always refer to the same object, but a variable name may refer to different objects at different times. The object referred to by a variable is changed when an assignment expression is evaluated. Assignments were not listed earlier as a type of expression since any expression can become an assignment by including an assignment prefix.


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	More than one assignment prefix can be included, indicating that the values of ~~serveral~~ variables are changed.		More than one assignment prefix can be included, indicating that the values of several variables are changed.

	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
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	{\| style="border: 1px solid black;"		{\| style="border: 1px solid black;"
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|nil\|\|refers to an object used as ~~thevalue~~ of a variable when no other object is appropriate . Variables that have not been otherwise initialized refer to nil.		\|nil\|\|refers to an object used as the value of a variable when no other object is appropriate . Variables that have not been otherwise initialized refer to nil.
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|true\|\|refers to an object that represents logical accuracy. It is used as an affirmative response to a message making a simple yes-no inquiry.		\|true\|\|refers to an object that represents logical accuracy. It is used as an affirmative response to a message making a simple yes-no inquiry.
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	{\| style="border: 1px solid black;"		{\| style="border: 1px solid black;"
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|~~HousehoidFinances~~ spend: 32.50 on: 'utilities'\|\|informs the financial history named HouseholdFinances that $32.50 has been spent on utility bills.		\|HouseholdFinances spend: 32.50 on: 'utilities'\|\|informs the financial history named HouseholdFinances that $32.50 has been spent on utility bills.
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|HouseholdFinances totalSpentFor: 'food'\|\|asks HouseholdFinances how much money has been spent for food.		\|HouseholdFinances totalSpentFor: 'food'\|\|asks HouseholdFinances how much money has been spent for food.
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	A message's selector is ~~aname~~ for the type of interaction the sender desires with the receiver. For example, in the message		A message's selector is a name for the type of interaction the sender desires with the receiver. For example, in the message

	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
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	the selectors are+ . Both messages ask the receiver to calculate and return a sum. These messages each contain an object in addition to the selector (4 in the first expression and increment in the second). The additional objects in the message are arguments that specify the amount to be added.		the selectors are +. Both messages ask the receiver to calculate and return a sum. These messages each contain an object in addition to the selector (4 in the first expression and increment in the second). The additional objects in the message are arguments that specify the amount to be added.


	The following two message expressions describe the same kind of operation. The receiver is an instance of FinancialHistory and will return the amount of money spent for ~~aparticular~~ reason. The argument indicates the reason of interest. The first expression requests the amount spent for utility bills.		The following two message expressions describe the same kind of operation. The receiver is an instance of FinancialHistory and will return the amount of money spent for a particular reason. The argument indicates the reason of interest. The first expression requests the amount spent for utility bills.

	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
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	# Binary expressions take precedence over keyword expressions.		# Binary expressions take precedence over keyword expressions.
	# Unary expressions take precedence over binary expressions.		# Unary expressions take precedence over binary expressions.
	# Parenthesized expressions take ~~precendence~~ over unary expressions.		# Parenthesized expressions take precedence over unary expressions.


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	When a block expression is encountered, the statements enclosed in the brackets are not executed immediately. The value of a block expression is an object ~~t hat~~ can execute these enclosed expressions at a later time, when requested to do so. For example, the expression		When a block expression is encountered, the statements enclosed in the brackets are not executed immediately. The value of a block expression is an object that can execute these enclosed expressions at a later time, when requested to do so. For example, the expression

	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
	actions at: 'monthly payments'		actions at: 'monthly payments'
	put: [HouseholdFinances spend: 650 on: 'rent'.		put: [HouseholdFinances spend: 650 on: 'rent'.
	~~HousehoidFinances~~ spend: 7.25 on: 'newspaper'.		HouseholdFinances spend: 7.25 on: 'newspaper'.
	HouseholdFinances spend: 225.50 on: 'car payment']		HouseholdFinances spend: 225.50 on: 'car payment']
	</syntaxhighlight>		</syntaxhighlight>

Onionmixer: 오타수정

2014-05-09T08:41:48Z

오타수정

← Older revision		Revision as of 08:41, 9 May 2014
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	The following example is a variable-name expression with an assignment prefix. It indicates that the variable named index should refer to the same object as does the variable named ~~initiallndex~~.		The following example is a variable-name expression with an assignment prefix. It indicates that the variable named index should refer to the same object as does the variable named initialIndex.

	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
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	This expression indicates that both the variables named index and ~~initiallndex~~ should refer to the number 1. Message expressions and block expressions can also have assignment prefixes, as will be seen in the following sections.		This expression indicates that both the variables named index and initialIndex should refer to the number 1. Message expressions and block expressions can also have assignment prefixes, as will be seen in the following sections.

Onionmixer: 내용 오류 수정

2014-04-21T05:36:46Z

내용 오류 수정

← Older revision		Revision as of 05:36, 21 April 2014
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	<syntaxhighlight lang="smalltalk">		<syntaxhighlight lang="smalltalk">
	[:newElement \|		[:newElement \|
	index ← index + 1.		index ← index + 1.
	list at: index put: newElement]		list at: index put: newElement]
	</syntaxhighlight>		</syntaxhighlight>

Onionmixer: SMALLTALK80 Chapter 2 Expression Syntax 페이지 추가

2014-04-21T05:33:36Z

SMALLTALK80 Chapter 2 Expression Syntax 페이지 추가

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Smalltalk80LanguageImplementation:Chapter 02 - Revision history

Onionmixer: 정오표 수정

Onionmixer: 오타수정

Onionmixer: 내용 오류 수정

Onionmixer: SMALLTALK80 Chapter 2 Expression Syntax 페이지 추가