JavaScript in Plain Language (2015)

PART I: AT THE GATES OF ENLIGHTENMENT

1.6 Lab work 2

Please fire up your JavaScript Console again
( CTRL SHIFT j or CMD SHIFT j or ALT-CMD-j ).

Declaring variables, assigning values, using basic properties and methods

( See the results on the next page )

1- Declare a variable named x and give it a string value of
"The quick brown fox jumps over the lazy dog".

2- Display x;

3- Find out the length of the data in variable x.

4- Display x in uppercase. Hint: toUpperCase()

5- Now convert the original x to uppercase, instead of just displaying it.

6- Call x again.

7- Finally convert the variable x to lowercase again. Hint: toLowerCase()

8- Call x just to be sure.

9- BONUS:
Declare variable y and assign it the value of x, but in uppercase.

10- Call y.

11- EXTRA, EXTRA BONUS:
Declare a variable named z and assign to it the numeric value of the length of x.

12- Call z.

(See the results on the next page. At this time, do the same exercises as you verify the answers on the next page. Practice, practice, practice)

Results:

1- Declare a variable named x and give it a string value of
"The quick brown fox jumps over the lazy dog":

var x = "The quick brown fox jumps over the lazy dog";

2- Display x:

x;

It displays "The quick brown fox jumps over the lazy dog"

3- Find out the length of the data in variable x:

x.length;

It displays 43, as of 43 characters including spaces.

4- Display x in uppercase:

x.toUpperCase();

It displays "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"

5- Now convert the original x to uppercase, instead of just displaying it:

x = x.toUpperCase();

6- call x again:

x;

It displays "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"

7- Finally convert the variable x to lowercase again:

x = x.toLowerCase();

8- Call x just to be sure:

x;

It displays "the quick brown fox jumps over the lazy dog"

9- BONUS:
Declare variable y and assign it the value of x, but in uppercase.
var y = x.toUpperCase();

10- Call y:
y;

It displays "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"

11- EXTRA, EXTRA BONUS:
Declare a variable named z and assign to it the numeric value of the length of x:
var z = x.length;

12- Call z:
z;
It displays 43, the value of z is 43.

END OF LAB