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Operator Type Member Unary
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Operators dot () square bracket ([]) new delete typeof instanceof void ++ -negation (-) logical not (!) bitwise not (~) multiply (*) divide (/) modulus (%) add (+) subtract (-) shift left (<<), unsigned shift right (>>>), signed shift right (>>)
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Multiplicative
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Additive Bitwise Shift TABLE 2-3
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Operators Available in JavaScript
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CHAPTER 2: Learn JavaScript Fundamentals
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Operator Type Relational
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Operators less-than (<) greater-than (>) less-than-or-equal (<=) greater-than-or-equal (>=) in equal (==) not equal (!=) strictly equal (===) strictly not equal (!==) bitwise and (&) bitwise or (|) bitwise exclusive or (^) logical and (&&) logical or (||) logical exclusive or (^^) conditional ( :) equals assignment (=) shortcut assignment (*=, /=, +=, -=, %=, <<=, >>=, >>>=, &&=, ||=, ^^=, &=, |=, and ^=) comma (,) function this
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Equality
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Bitwise Logical
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Logical
Conditional Assignment
Special
TABLE 2-3
Operators Available in JavaScript (continued)
JavaScript 20 adds two new operators to the language, and they are both considered relational:
is as
We have already seen a few of these operators in action so far in this chapter, such as equals (==), greater-than (>), increment (++), in, and equals assignment (=) Most of these operators have their origin in mathematics Additional operators exist to deal with logical Booleans (such as logical and and logical or), plus binary operators to deal with the ones and zeros of binary math
Organize Your Code into Functions
There may be the occasional instance when you can sit down and write an entire JavaScript program without functions, but believe it or not, that type of JavaScript program is rare Most JavaScript programs contain at least one function
How to Do Everything with JavaScript
Functions allow you to predefine a group of JavaScript statements before you actually need to call that code Since functions can be called repeatedly, with varying parameters, they are also convenient time-savers
Define Functions
Functions are defined using the function keyword Functions must be assigned a name and can optionally take one or more parameters Parameters are contained in brackets, and separated by commas
function name(parameter1, parameter2, , parameterN) { statements; }
This is the JavaScript 15 format for defining functions JavaScript 20 introduces some powerful extensions to this basic format, by allowing parameters to have a data type, the function itself to have a data type, parameters to be optional, named parameters, and more We will examine the JavaScript 20 functions later in this chapter The parameters specified inside the function definition are treated as variables inside the function Parameter names must be unique, in that two parameters of the same function cannot have the same name From the basic function syntax, we can define a basic function:
function add_two(x, y) { if (x > 7) { x = x - 7; } else { x = x + 7; } if (y > 18) { y = y - 18; } else { y = y + 18; } return x + y; }
The preceding code creates a function called add_two() This function accepts two parameters, named x and y The function s name and the parameters it accepts are defined in the first line of code:
function add_two(x, y) {
The function s code defines a somewhat complicated way to add two numbers together First, the contents of both x and y are examined, and depending on their values something is added or subtracted from each
CHAPTER 2: Learn JavaScript Fundamentals
if (x > 7) { x = x - 7; } else { x = x + 7; } if (y > 18) { y = y - 18; } else { y = y + 18; }
Then the two numbers are added together and the result is returned With the addition of a return statement that returns a result, this function can act as an expression, by returning a value
return x + y;
Now the code just defines a function If you were to add this into our HTML template and try to execute it in a web browser, it would actually do nothing Functions need to be called in order to run And if a function defines one or more parameters, values must be given for those as well In order to call a function, you must do the following: 1 Type its function name followed by an open parenthesis:
add_two(
2 Provide a list of parameters, if required, separated by commas:
add_two(12, 2
3 Followed by a close parenthesis and a semicolon:
add_two(12, 2);
4 Of course, in the case of our function, we need to assign its return value to a variable, or use it in a context that expects a value:
var result = add_two(12, 2);
We can combine the function definition, our HTML template, and a bit of code that calls our function with various parameters as follows:
<html> <head> <title>JavaScript sample code</title> </head> <body> <h1>Defining JavaScript Functions</h1> <script language="JavaScript" type="text/javascript">
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