asp.net barcode scanning INTRODUCING OPERATIONS AND COERCION in Objective-C

Creation Quick Response Code in Objective-C INTRODUCING OPERATIONS AND COERCION

CHAPTER 9 INTRODUCING OPERATIONS AND COERCION
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Note that in the previous example, the strings from the lists appear to have been concatenated without anything between them. What actually happened is that when a list is coerced into a string, the value in AppleScript s text item delimiters variable becomes the separator between the items. See the following example: set text item delimiters to "; " set display_items to {"London", "France", "Athens"} as string Result: "London; France; Athens"
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Record
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Records can be coerced only into a list. All that happens is that they shed their labels.
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Mixing Expressions and the Mighty Parentheses
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One of the fun things about forming expressions is that the same expression with the same result can be spread over multiple lines in the script or be crammed into a single line. In some cases, you would want to create expressions that contain more than one simple operation. What s important to remember is that an operation has one or two operands and a single operator. Complex operations, then, are really expressions made up of many nuclear operations. Let s look at the following operation as an example: 5 + 5 + 3 It appears to have three operands and two operators, right Well, yes and no. The way AppleScript attacks this statement is by first resolving the leftmost operation: 5 + 5. The result of this is then used as the left operand for the following operation: 10 + 3. So as you can see, there are really four operands after all. In a sense, AppleScript does this: 5 + 5 = 10 10 + 3 = 13 Table 9-4 lists AppleScript s operators in precedence order. When resolving these sorts of complex expressions, AppleScript uses different rules of precedence to determine two things the order in which operations of different precedence should be resolved (shown in the Order column in the following table, which originally appeared in the AppleScript Language Guide) and the direction in which to resolve operations whose operators have the same precedence level, such as multiplication and division (shown in the Form of Association column). Table 9-4. AppleScript s Operators in Precedence Order
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Order
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1 2 3 4 5 6 7 8
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Operators
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() +, ^ *, /, div, mod +, & as <, , >,
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Form of Association
Innermost to outermost Unary Right to left Left to right Left to right Left to right Left to right None
Type of Operator
Grouping Plus or minus sign for numbers Exponentiation Multiplication and division Addition and subtraction Concatenation Coercion Comparison
Continued
CHAPTER 9 INTRODUCING OPERATIONS AND COERCION
Table 9-4. Continued
Order
9 10 11 12
Operators
=, not and or
Form of Association
None Unary Left to right Left to right
Type of Operator
Equality and inequality Logical negation Logical for Boolean values Logical for Boolean values
Understanding Precedence Rules
Although the order of precedence resolves some of the confusion, quite a few operators have the same order of precedence, such as plus and minus. The Form of Association column in Table 9-4 explains how AppleScript deals with statements that contain multiple operators with the same precedence level.
Left to Right and Right to Left
Operators marked left to right are evaluated in that order when more than one operator from the same precedence exists. For instance, the following operation: 12 + 5 + 30 --> 47 will be resolved as follows: 12 + 5 = 17 -- leftmost 17 + 30 = 47 The result of the previous operation (17) is now the left operand.
Unary
A unary operator, as used in AppleScript, is one that takes a single operand to its right; for instance: -7 The minus operator in this case turns the positive number operand to its right into a negative number and a negative number into a positive one. If you type multiple unary operators of equal precedence all in a row, they start evaluating from the one closest to the operator, going further and further away. Look at the following statement: not not not true Here s how AppleScript looks at the preceding statement: not (not (not true)) In fact, if you do use the statement without the parentheses, when you compile the script, AppleScript will add parentheses for you!
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