EXERCISES


1:

Create an array of five animals. Use a for loop to display the values stored there. Now add two more animals to the end of the array and sort the array. (Use JavaScript's built-in array methods .) Display the sorted array.

2:

Create an associative array called colors . Each element of the array is a string representing the color , e.g., red or blue . Use the for/in loop to view each element of the array with a color of the font the same color as the value of the array element being displayed.

3:

Create a function that will return the current month by its full name . Use the Date object to get the current month. Months are returned as 0 for January, 1 for February, 2 for March, etc. Output should resemble:

 
 The current month is January. 

Hint: You can create an array, starting at index 0, and assign a month value to it; e.g., month[0]="January" or use a switch statement, e.g., case 0: return "January" .

4:

An invoice is due and payable in 90 days. Write a function that will display that date.

5:

How many days until your birthday? Write a function to calculate it.

6:

To calculate the balance on a loan, the following formula is used:

PV = PMT * ( 1 “ (1 + IR ) “NP ) / IR

PV is the present value of the loan; PMT is the regular monthly payment of the loan; IR is the loan's interest rate; NP is the number of payments remaining. Write a JavaScript statement to represent this formula.

7:

Using the formula to calculate the loan balance from the last exercise, write a function that will calculate the principle balance left on a loan where the monthly payments are $600, the annual interest rate is 5.5%, and there are 9 years remaining on the loan. Use the toFixed() Number method to format the output.

8:

Apply the ceil(), floor() , and round() methods to the number 125.5567 and display the results.

9:

Create an array of 10 fortune cookies that will be randomly displayed each time the user reloads the page.

10:

Create a string prototype that can be used to create an italic, Verdana font, point size 26.

11:

Calculate the circumferance of a circle using the Math object.

12:

Write a JavaScript program that uses the Array and Math objects. Create an array of 5 sayings, for example: " A stitch in time saves 9" , or "Too many cooks spoil the broth" . Each time the Web page is visited, print a random saying.

13:
  1. Use the Date object to print today's date in this format:

     
     Today is Friday, June 16, 2003. 
  2. Calculate and display the number of days until your next birthday.

  3. Create a prototype for the Date object that will print the months starting at 1 instead of 0.

14:
  1. Create a String object containing "Jose lived in San Jose for many years."

  2. Find the index for the second Jose .

  3. Get the substring ear from years .

  4. Display the string in a blue, italic font, point size 12, all uppercase.




JavaScript by Example
JavaScript by Example (2nd Edition)
ISBN: 0137054890
EAN: 2147483647
Year: 2003
Pages: 150
Authors: Ellie Quigley

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