Operator in Java

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Operator
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5: JavaScript Operators
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Often used as a short if/else type of statement A condition is placed before the question mark ( ) and a value is placed on each side of the colon (:) Evaluates the statements on both sides of the operator, and returns the value of the second statement Used to delete an object, a property, or an element in an array Returns true if a property is in a specified object Returns true if an object is of a specified object type Creates an instance of an object Refers to the current object Returns a string that tells you the type of the value being evaluated Allows an expression to be evaluated without returning a value
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Comma Delete In Instanceof New This Typeof Void
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Table 5-5
Special Operators
Special Operators
There are a number of special operators in JavaScript that are used to perform specific tasks, or to aid in shortening code Table 5-5 lists the special operators and their purposes Don t be discouraged if many of the terms used in this table look unfamiliar Objects, arrays, and other unfamiliar terms are discussed in later chapters Many of these operators will be reintroduced at the appropriate point in the later chapters, where their purpose can be expressed more clearly
Ask the Expert
Q: A:
Why are there so many assignment operators If I can write x=x+1 instead of x+=1, why do I need to know about the extra assignment operators They are provided as shortcuts, so that you don t need to type the variable name a second time in the same line They also cut down the overall size of the script a bit, which helps with the loading time of the Web page You can use either method; it just depends on how much you want to trim the script size or avoid extra typing Also, it is good to know what these assignment operators do, so that you can recognize their purpose in scripts Can I use more than one operator at a time in a statement What will happen if I do that Yes, you can use multiple operators in a single statement The operators will be executed according to their precedence in the order of operations, which is covered in the next section
Q: A:
(continued)
JavaScript: A Beginner s Guide
Q: A: Q: A:
What is with all of the parentheses Why are they used in some cases but not in others Is there a reason for them The parentheses used so far have been added for the readability of the statements In some cases, it is necessary to use parentheses to get a desired result This is something else that is covered in the next section Are there any common typos that are made with all of these operators Often, the assignment operator (=) gets used in place of the comparison operator (==) because the second equal sign is left off by accident Also, forgetting to use && and typing just & is another common typo that can cause trouble in a script The same sort of mistake can occur with the logical OR (||) and bitwise OR (|) operators
Understanding Order of Operations
In JavaScript, the operators have a certain order of precedence In a statement with more than one operator involved, one may be executed before another, even though it is not in that order in the statement For instance, look at this example:
var answer=8+7*2;
If you remember how this works in mathematics, you will know that the multiplication is performed first on the 7*2 part of the statement, even though it does not look like that is the right order when you read from left to right The reason the multiplication is performed first is that the multiplication operator has a higher precedence in the order of operations than the addition operator So, any multiplication done within a statement will be performed before any addition, unless you override it somehow As with math problems, in JavaScript, the way to override the order of operations is through the use of parentheses to set off the portion of the statement that should be executed first Thus, if you wanted to be sure the addition was performed first in the preceding example, you would write it as shown here instead:
var answer=(8+7)*2;
If you use more than one set of parentheses or operators of the same precedence on the same level, then they are read from left to right, as in this example:
var answer=(8+7)-(4*3)+(8-2);
Since the parentheses are all on the same level (not nested), they are read from left to right The addition and subtraction operators outside the parentheses have the same precedence, and thus are also read from left to right
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