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.


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.


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" .


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


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


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.


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.


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


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


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


Calculate the circumferance of a circle using the Math object.


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.

  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.

  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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