Feedback homework week 2

[remarcmij]

Hi Jim, here is my feedback on your homework.

• Your repo is missing the .eslintrc.json file that we discussed in the lecture. Please check the VSCode Tips on how to create one.
• The folder week1 should actually be called week2 as week1 was the Git session with Unmesh.

When I run your Christmas.js file I get immediately a run-time error:

let y = "Cat";
     ^

SyntaxError: Identifier 'y' has already been declared
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:599:28)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Function.Module.runMain (module.js:676:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

That means I can't continue the review until you make corrections. How did you test your code? Please make sure that what you give me to review is able to run without requiring modifications from my side.

Let me know when it is corrected and I'll look again.

[Jim-Abdul]

Thanks mr.Jim for your feedback,
I fixed it , i am looking forward to hearing from you the new feedback.

[remarcmij]

Hi Jim,

Here is my updated feedback:

• The .eslintrc.json file should be created in the root folder of the repo (hyf-javascrip1). This is the folder that you should in VSCode when you work on your homework.
• The folder for your homework in week 2 should be week2 and not week1.
• There are some minor formatting issues which indicate to me that your VSCode doesn't have the settings applied correctly that we did in class. Please check again in VSCode Tips.

exercise 3

• You commented out the line let x;. However the assignment asked for '3.1 First, declare your variable x(do not initialize it yet).' The idea was to predict that the value would be undefined and then console.log it to confirm your prediction.

exercise 4

• By commenting out some lines you do not completely follow the assignment.

exercise 5

• There is a bug in your code:

let m = "";
if (z > a) {
  let m = z;
}
else {
  let m = a
}

console.log(m);

All variables declared with let have block scope. Therefore the variables m inside the if and else block are different from the first m variable. When you console.log the variable m you will see that it is an empty string and not the highest of the two numbers. If all is well you should have seen in VSCode that the m variables inside the if statement are green underlined by eslint. You should follow up on warnings like that. See if you can solve the bug.

Also take note of the formatting if the if statement.

Note: if you want to declare a variable without initialising it just do let m;. This declares the variable but leaves its value undefined. There is no point in assigning it an empty string as you did in let m = "";

Besides using an if statement, there is also another way of finding the highest of two numbers. Google for 'mdn math' and see what you can find.

exercise 6

• An empty array looks like this: let myEmptyArray = [];. What you have defined is a non-empty array with three elements, each consisting of an empty string.
• Be consistent in your use of upper- and lowercase. If your initial array contains animal names that start with an uppercase letter, then I would expect you to add a "Baby Pig".
• Be consistent in your choice for single ' or double " quotes to define strings. Choose one or the other and then use it consistently.

exercise 7

• The variable length is green underlined by eslint. It warns that you have assigned this variable a value but are not using it.

exercise 8

• You should not use else if here. This causes all subsequent conditions to be skipped as soon a condition is evaluated as true. Suppose name === age was true (it is not, but just suppose). That would print out the first console.log statement and then skip all the other tests.

  The correct way is to have separate if statements for each condition:

if (name === age) {
    console.log(name + 'and' + age + 'are the same type');
}
if (name === arr) {
  console.log(name + 'and' + arr + 'are the same type');
}
...

Bottom line: still one bug to fix.