qr code library java free download Using the Conditional Operator in Java

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Using the Conditional Operator
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The conditional operator (often called the ternary operator) is one that can be used as a short way to assign a value based on a condition For instance, you might decide you want to assign a value to a variable based on the result of a conditional statement You could do it using the following code:
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var mynum=1; var mymessage; if (mynum==1) { mymessage="You win!";
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6: Conditional Statements and Loops
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} else { mymessage="Sorry! Try again!"; }
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This works, and gives mymessage a value of You win! since mynum is equal to 1 However, the conditional operator allows you to shorten the amount of code required for this type of test It allows you to place a condition before the question mark ( ) and place a possible value on each side of the colon (:), like this:
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varname = (conditional) value1 : value2;
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JavaScript evaluates the conditional statement and if the statement returns true, the value on the left side of the colon (value1 here) is assigned to the variable If the statement returns false, the value on the right side of the colon (value2 here) is assigned to the variable To apply this to our previous example, we could rewrite the entire piece of code as follows:
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var mynum=1; var mymessage; mymessage = (mynum==1) "You win!" : "Sorry! Try Again!";
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This works the same way as the previous if/else block, but allows you to write the code with a lot less typing (lessening the size of the script) It should be noted that you can also use another method to shorten the script if using the conditional operator is not comfortable for you Since JavaScript is lenient, you can omit the curly braces anytime you have only one statement to execute in a code block For instance, the following code could also be used as a shorter version of the script:
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var mynum=1; var mymessage; if (mynum==1) mymessage="You win!"; else mymessage="Sorry! Try again!";
Also, since JavaScript is not concerned with white space or line breaks between tokens, you can also further shorten this to have the entire if/else block on one line:
var mynum=1; var mymessage; if (mynum==1) mymessage="You win!"; else mymessage="Sorry! Try again!";
For now, you will want to use the method that you feel most comfortable using As you gain scripting experience, the conditional operator will be a handy way to shorten your code and help you optimize the size of your scripts when this type of comparison is needed The conditional statements you have used in this chapter will allow you to do much more with your scripts now that you know how to use them You will be using these extensively in later chapters, because they can help you code more complex scripts that perform more tasks than you could without them
JavaScript: A Beginner s Guide
Ask the Expert
Q: A:
Do I need to use curly brackets on every if/else block I have seen them used in code on the Web without the brackets Why There is a shortcut that allows you to omit the curly brackets if you are only going to execute a single JavaScript statement in the if block and the else block If you are going to execute more than one statement, the curly brackets should be used For example, look at the following code:
if (x==2) { windowalert("Hi"); } else { windowalert("Bye"); }
Since only one JavaScript statement is used inside the code blocks, you can use a shortcut that allows you to omit the brackets:
if (x==2) windowalert("Hi"); else windowalert("Bye");
As you can see, it can save you some typing (which is why you see this technique often in scripts on the Web) Keep in mind, however, that if you decide to add more statements within one of the blocks, you will need to add the brackets back around the code in that block
Q: A:
Why I am bothering with conditional statements if all I can do is assign the variable a value and then test it If I already know what the value of the variable is, why use a conditional In later chapters, you will get to the point where you are getting information from the viewer This information can vary depending on the viewer (for example, if the viewer needs to enter his/her name into a text box or a prompt), thus making the conditional blocks more useful since you will be able to perform one action for one viewer, and another task for a different user With user input, you won t know the value of the variable beforehand, and you will need to handle the possibilities using conditional blocks
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