Review Tasks (show me what you've got)

(In VSCode)

Make sure you've gone over the review of Gr. 11.

You've reviewed grade 11 skills:

It's time to code!


Given the string str, return whether or not the string contains any uppercase letters (true or false).

b)  contains_lowercase(str)

Given the string str, return whether or not the string contains any lowercase letters (true or false).

Hints:  you will likely need to use the .toUpperCase() and .toLowerCase() functions. Although there are other ways to do it.

Note #1 - return values do not show on the console. If you want to see them, you'll need to print them.
For example:  console.log(contains_uppercase("Hello World"));
or:   let result = contains_lowercase("NOPE");   and then print result.

Note #2 - part of this course is writing more readable and short code. Each of the above functions has a very descriptive name. Try to use this style of code whenever you work from now on. 

Note #3 - part of this course is writing short or more efficient code (those are two different things). The above functions can both be done in one line. Without Googling it - can you do them in one line?

2. pwd_check(password):

A password is considered secure if it follows all of these rules, in order:

Your function, pwd_check(password), will return true if the given password passes all of these rules and false otherwise. Furthermore, if the return value is going to be false, it also prints to the console the (first) rule that was failed. Hint: print to the console before the return.



"Your password must contain a number."




"Your password must contain an uppercase and lowercase letter."



pwd_check("PassWord 123!");

"Your password must not contain spaces."






3. lotto649():

Ontario's Lotto 6/49 requires you to select six unique numbers from 1-49. If you match all 6 randomly chosen numbers - you win the lottery! Your job is to write the program that selects the 6 unique random numbers for the lottery and then print them to the screen in ascending order. As a precaution, your function should also return an array containing the selected numbers.

For Example:







[4,21,22,34,41,44]    // That's the returned array which likely won't show on the console

Your program should not select the same number twice!

Hints:  while-loop, for-loop, Math.random( ), Array.sort( )

4. dice_roll_stats(sides, rolls):

When you roll two dice, the probability of a certain sum depends on the number of sides on the dice. For example, two 6-sided dice have a 2.78% chance of snake-eyes (two 1's) or 12 (two 6's). There is a 16.67% chance of rolling a 7. But what if the dice have 8 sides each? 20?

You will write the function dice_roll_stats(sides, rolls) that takes the number of sides on the dice (minimum 4, maximum 20) and calculates experimental probabilities using the number of rolls given. The sides will be equal for both dice.

The function will "roll" two dice and keep track of the outcome. It will continue to do this rolls times. Afterward, the results are printed to the screen in a particular format.

First, the output will list the possible outcomes (separated by a tab "\t").
Then, the output will list the number of times each sum was recorded  (separated by a tab "\t").
Finally, the output will list the probability (as a percent, rounded to two decimals) for each sum  (separated by a tab "\t").

The output won't be pretty - wouldn't it be great if we could use HTML?

Example:  dice_roll_stats(6, 10000)

2 3 4 5 6 7 8 9 10  11  12  

285 570 818 1079  1392  1676  1444  1122  789 559 266

2.85% 5.7%  8.18% 10.79%  13.92%  16.76%  14.44%  11.22%  7.89% 5.59% 2.66%

dice_roll_stats(10, 10000)

2 3 4 5 6 7 8 9 10  11  12  13  14  15  16  17  18  19  20  

106 198 303 386 491 598 726 815 913 1015  941 767 696 557 489 404 277 202 116

1.06% 1.98% 3.03% 3.86% 4.91% 5.98% 7.26% 8.15% 9.13% 10.15%  9.41% 7.67% 6.96% 5.57% 4.89% 4.04% 2.77% 2.02% 1.16%

The examples above are actual output.