JavaScript: The Web Warrior Series

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JavaScript Web Warrior textbook Chapter 2 Hands on Project 2-2 debrief

Escape Characters and Sequences 1. Explain why a student must use extra care when using single quotation marks with possessives and contractions in strings. Define an escape character as a character that tells the compiler or interpreter that the character that follows it has a special purpose.

Mention that when you combine the escape character with other characters, the combination is called an escape sequence. Most escape sequences carry out special functions. Use Table to show the JavaScript escape sequences. Refer to the code on Page to illustrate an example of a script containing strings with several escape sequences.

Use Figure to illustrate the output. More information on the JavaScript string object may be found at: www. Quick Quiz 2 1.

JavaScript The Web Warrior Series 6th edition by Vodnik Gosselin Test Bank by auoie14 - Issuu

Answer: data type 2. Answer: integer 3. True or False: Empty strings are valid values for literal strings. Answer: True 4. Answer: True 5. Answer: escape sequence. Using Operators to Build Expressions 1. Use Table to discuss the operator types that can be used with JavaScript. Explain the difference between a binary operator and a unary operator. Arithmetic Operators 1.


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Mention that arithmetic operators are used in JavaScript to perform mathematical calculations, such as addition, subtraction, multiplication, division and returning the modulus remainder. Arithmetic Binary Operators 1. Use Table to show the arithmetic binary operators available in JavaScript. Refer to the code on Pages to illustrate examples of expressions that include arithmetic binary operators. Use Figure to show how the expressions appear in a web browser: 3.

Mention that that when JavaScript performs an arithmetic calculation, it performs the operation on the right side of the assignment operator, and then assigns the value to a variable on the left side of the assignment operator. Mention that a student can include a combination of variables and literal values on the right side of an assignment statement. Provide examples. Note that a student cannot include a literal value as the left operand because the JavaScript interpreter must have a variable to which to assign the returned value.

Describe how the JavaScript interpreter attempts to convert string values to numbers when performing arithmetic operations on string values. Mention that the JavaScript interpreter does not convert strings to numbers when a programmer uses the addition operator. Arithmetic Unary Operators 1.

JavaScript: The Web Warrior Series by Don Gosselin, Sasha Vodnik (Paperback, 2014)

Use Table to show the arithmetic unary operators available in JavaScript. Explain the difference between a prefix operator and a postfix operator. Explain when to use arithmetic unary operators. Use the code at the top of Page and Figure to illustrate a simple script that uses the prefix increment operator. Use the code starting at the bottom of Page and Figure to illustrate a simple script that uses the postfix increment operator.

More information on JavaScript operators - string and arithmetic operators may be Teaching found at: www. Assignment Operators 1. Mention that assignment operators are used for assigning a value to a variable. Describe compound assignment operators. Use Table to review the assignment operators available in JavaScript. Refer to the code on Page to illustrate examples of the different assignment operators. All time for the student to modify the ft.


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Comparison and Conditional Operators 1. Define comparison operators relational operators as operators used to compare two operands, and determine if one numeric value is greater than the other. Note that a Boolean value of true or false is returned after two operands are compared. Use Table to point out the JavaScript comparison operators. Mention that a programmer can use number or string values as operands with comparison operators.

When two numeric values are used as operands, the JavaScript interpreter compares them numerically. Point out that the conditional operator executes one of two expressions, based on the results of a conditional expression. Describe the syntax for the conditional operator. Review the code on Page , illustrating an example of the conditional operator. Allow time for students to complete the exercise on Pages to create functions for the estimate form that add the cost of a memory book and reproduction rights.

Understanding Falsy and Truthy Values 1. Introduce the six values treated in comparison operations as the Boolean value false. Emphasize that all values other than these six falsy values are the equivalent of the Boolean true, and are known as truthy values. Illustrate the use of falsy and truthy values, using the code at the top of Page Logical Operators 1.

Explain that logical operators are used to modify Boolean values or specify the relationship between operands in an expression that results in a Boolean value. Use Table to describe the JavaScript logical operators. Note that logical operators are often used with comparison operators to evaluate expressions, allowing a programmer to combine the results of several expressions into a single statement. Review the example code on Pages Teaching More information on JavaScript comparison and logical operators may be found at: www.

Special Operators 1. Use Table to discuss the special operators in JavaScript. These operators are used for various purposes and do not fit within any other category. Discuss why the typeof operator is useful. Describe the syntax of the typeof operator. Use Table to list the values that can be returned by the typeof operator. Understanding Operator Precedence 1. Explain what is meant by the term operator precedence. Use Table to show the order of precedence for JavaScript operators. Use Figure to explain left to right associativity and Figure to explain right to left associativity.

Allow time for the students to modify the calcStaff function to include mileage charges, following the steps on Pages More information on JavaScript increment and decrement operators - Operator Precedence may be found at: www. Quick Quiz 3 1. Answer: Operands 2. True or False: A unary operator requires an operand before and after the operator.

Answer: False 3. True or False: A prefix operator is placed before a variable. Answer: Assignment 5.

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Answer: Logical 6. Answer: associativity. Class Discussion Topics 1. What are the similarities between a function and a procedure? Why does there need to be a set order of precedence for the JavaScript operators? Have each student write a script in which he or she: a. Defines a function called paySalary that receives the name of an employee and the number of hours worked.

Prints onto the screen the name of the employee and the salary for that employee. Declares a variable called hoursWorked1 and assigns it the value Prints the variables onto the screen in such a way that the following is displayed on the screen: Susan Harper has worked 45 hours. Additional Resources 1. Core JavaScript 1. JavaScript Tutorial: www. JavaScript Operations on Variables: www. JavaScript Tutorial - Variables: www. See More. JavaScript, Sixth Edition 6. Teaching Tip More information on JavaScript functions may be found at: www. Answer: global JavaScript, Sixth Edition 5.

Answer: local Working with Data Types 1. JavaScript, Sixth Edition 3. Teaching Tip More information on the JavaScript string object may be found at: www.