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Quiz
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1 You reference computer memory by using a Operator b Variable name c Literal value d Variable type
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CHAPTER 2 Variables, Operators, and Expressions
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2 What tells the browser to do something a Mathematical expression b JavaScript expression c JavaScript statement d Logical expression 3 In the expression 1 + 1, what part of the expression are the numbers a Operand b Operator c Modulus d Incrementer 4 In the expression 1 + 1, what part of the expression is the plus sign a Operand b Operator c Modulus d Incrementer 5 What is happening in the expression ++a a The value of a is increased by 2 b The value of a is increased by 1 c The value of a is multiplied by itself d Nothing; this is not a valid JavaScript expression 6 Evaluate this expression: 7 < 10 'You win' : 'You lose' a 10 b You lose c You win d 7 7 What does the && operator do a Evaluates true if expression on its left and right are both true b Evaluates true if expression on its left or right is true c Evaluates true if neither expression on its left or right is true d Combines the expression on its right with the expression on its left
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JavaScript Demysti ed
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8 True or False: The ++ can be on either the right (c = a++) or left (c = ++a) side of an expression without having any effect on the expression a True b False 9 True or False The x += y expression adds values of x and y and stores the sum in x a True b False 10 True or False The != operator makes a false true a True b False
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CHAPTER
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Condition Statements
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You can add smarts to your web pages by using JavaScript to enable the browser to make decisions on the y as a user is sur ng your web site You ve seen this countless times on commercial web sites with pages tailored to a speci c type of visitor In this chapter, you ll learn the secrets of how to incorporate such dynamic features into your web pages The secret lies in using JavaScript, a condition statement, and a conditional expression, which you learned how to write in 2 This combination lets you de ne how a browser makes a decision and what happens next In this chapter, you ll learn how to tell the browser to evaluate a condition and execute certain JavaScript statements if the condition is true and execute other JavaScript statements if the condition is false A condition statement is a type of JavaScript statement that tells the browser to evaluate a condition such as whether or not a user ID and password are valid, and based upon this evaluation, either execute or skip one or more statements in the
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JavaScript Demysti ed
JavaScript The three types of condition statements are the if statement, switch case statement, and the loop statement The if statement tells the browser to execute one or more statements if a conditional expression is true You ll see how the if statement works in this chapter The switchcase statement compares one value to one or more known values Statements that are associated with the known value are executed if a match occurs You ll see how this is done in this chapter The loop statement tells the browser to execute statements repeatedly as long as a condition is true If the condition is false, statements are not executed You ll learn more about using a loop statement in this chapter
Comments
Before we get started analyzing statements, you should know a thing or two about how to add comments in JavaScript In the following example, the code block comprises one line below the if statement Throughout this chapter, when the form (syntax) of the JavaScript is being discussed, the comment line is used to show you where the code block statement will appear
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