move beetle to leaf | Together Java | Page 1

rancid frigateBOT Aug 18, 2023, 6:40 AM

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<@&987246399047479336> please have a look, thanks.

rancid frigateBOT Aug 18, 2023, 6:40 AM

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rancid frigate <@&987246399047479336> please have a look, thanks.

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thin nebula Aug 18, 2023, 7:01 AM

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Why Do you have the inner if two Times?

velvet bay Aug 18, 2023, 7:03 AM

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if theres a Tree Right / Tree Left and if theres no Tree Right = no Tree Left

jolly flare Aug 18, 2023, 7:12 AM

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velvet bay if theres a Tree Right / Tree Left and if theres no Tree Right = no Tree Left

i dont quite follow ur logic. could u explain it in simple words quickly?

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like, just look at the picture:

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and tell me how ur beetle works

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without going into detail on the code

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is it trying to hug the right wall?

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like this?

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https://i.imgur.com/pluJZIF.png

Imgur

velvet bay Aug 18, 2023, 7:15 AM

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yeah i'm trying to hug the right wall

jolly flare Aug 18, 2023, 7:15 AM

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or whats ur "idea"?

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so like the above pic?

velvet bay Aug 18, 2023, 7:15 AM

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yeah

jolly flare Aug 18, 2023, 7:15 AM

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okay. then lets break down the logic for that

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its a priority based system

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the priority is to go right if possible

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if thats not possible, u want to go forward

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if thats not possible, left

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if thats not possible, back

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so:

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right
forward
left
back

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this "logic" should be visible in ur code exactly like that

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are u familiar with creating ur own methods already?

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like creating helper methods

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are u familiar with enums already?

velvet bay Aug 18, 2023, 7:18 AM

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i'm familiar with creating void statements, enums i'm assuming is i < 0 etc ?

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sorry i'm fairly new

jolly flare Aug 18, 2023, 7:18 AM

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no worries. im just asking, otherwise i cant suggest u a solution/approach thats familiar to u

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enums are this:

enum Weekday {
  MONDAY,
  TUESDAY,
  WEDNESDAY,
  ... // im too lazy, lol
}

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and then u can use them in ur code

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cause that way we could create ourselves a neat little helper method that would look like

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boolean result = tryMove(Direction.LEFT);

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but if u didnt learn that yet, we can do it differently as well

rancid frigateBOT Aug 18, 2023, 7:21 AM

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move beetle to leaf

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Changed the title to move beetle to leaf.

velvet bay Aug 18, 2023, 7:21 AM

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i'm not sure if enum is allowed in the code

jolly flare Aug 18, 2023, 7:21 AM

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alright

velvet bay Aug 18, 2023, 7:21 AM

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but boolean statements should be legal

jolly flare Aug 18, 2023, 7:21 AM

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yeah, no worries

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lets just write it all in one method for today

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are u familiar with continue?

velvet bay Aug 18, 2023, 7:21 AM

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yeah

jolly flare Aug 18, 2023, 7:21 AM

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perfect

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so the first technique u should know is "early-return". or in this case "early-continue". it will increase readability of ur code

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instead of writing:

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while (...) {
  if (...) {
    ...
    if (...) {
      ...
      if (...) {
        ...
        if (...) {
          ...
        }
      }
    }
  }
}

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u can write:

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while (...) {
  if (...) {
    ...
    continue;
  }
  if (...) {
    ...
    continue;
  }
  if (...) {
    ...
    continue;
  }
  if (...) {
    ...
    continue;
  }
}

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that way u reduce the nesting of ur code dramatically

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which makes it much more readable in general

velvet bay Aug 18, 2023, 7:24 AM

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just to clarify the continue statement is similar to a break but i can keep writing functions

jolly flare Aug 18, 2023, 7:24 AM

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break ends the loop

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continue only ends the current iteration

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and goes into the next iteration of the loop

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example:

// instead of this
void buySomeGames() {
  if (hasMoney()) {
    buyGame();
    if (hasMoney()) {
      buyAnotherGame();
    }
  }
}

// do this
void buySomeGames() {
  if (!hasMoney()) {
    return;
  }
  buyGame();

  if (!hasMoney()) {
    return;
  }
  buyAnotherGame();
  }
}

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so this is the early-return idea in a more concrete example

velvet bay Aug 18, 2023, 7:25 AM

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so would this be ok?
if (treeFront()) {
if (!treeRight()) {
turnRight();
move();
else {
turnLeft();
continue;
}
if (!treeRight()) {
turnRight();
move();
}
else {
move();
continue;

jolly flare Aug 18, 2023, 7:25 AM

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wait on that please

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ur still nesting too much

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and the priority is not clearly visible in ur code

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its hard to understand that logic

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so ur loop is correct.

while (!onLeaf()) {
  ...
}

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now lets start with the first priority

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which was moving to the right

velvet bay Aug 18, 2023, 7:27 AM

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yep

jolly flare Aug 18, 2023, 7:27 AM

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mh actually

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now that i think about it

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i doubt we can get rid of nesting

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oh wait

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we can

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okay

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so lets move to the right, if possible

velvet bay Aug 18, 2023, 7:27 AM

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if we can get the bettle to hug right wall it will reach the end

jolly flare Aug 18, 2023, 7:28 AM

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if (!treeRight()) {
  turnRight();
  move();
}

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this is the move-right logic

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so far so good?

velvet bay Aug 18, 2023, 7:28 AM

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yep following along (thx for the help :D)

jolly flare Aug 18, 2023, 7:28 AM

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"if we can move to the right, lets move to the right"

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now, we realize that if we moved to the right, there is no work left to do anymore

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we are done

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with this iteration of the loop

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so... we continue;

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while (!onLeaf()) {
  if (!treeRight()) {
    turnRight();
    move();
    continue;
  }

  ...
}

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and now u can put the next block

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directly next to it

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without nesting

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since u got an implicit else now

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whatever u write at the ... can only be executed if we didnt move to the right yet

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cause otherwise the continue would have ended the iteration already

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so this is like using else, just without using it

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which improves readability, since we have a level of nesting less

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still following along, or is it confusing?

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the main readability issue of ur code is the nesting. so this is a very common technique to improve on that

velvet bay Aug 18, 2023, 7:32 AM

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the beetle immediately turns right, I need to find a way to make her move beforehand

jolly flare Aug 18, 2023, 7:33 AM

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thats okay

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its expected

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the logic is correct like that

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remember the list of priorities

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right
forward
left
back

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theres no point in executing the code yet

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its not done yet

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but we cant continue with the logic if its not 100% clear to u now

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cause the next piece, u have to write urself

velvet bay Aug 18, 2023, 7:34 AM

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i'm having a hard time comprehending why right is more important than forward

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when writing loops isnt thinking abotu the end important?

jolly flare Aug 18, 2023, 7:35 AM

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we can also change the priority list. but that was the idea we had initially

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otherwise the movement is different

jolly flare Aug 18, 2023, 7:35 AM

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velvet bay when writing loops isnt thinking abotu the end important?

the end is "when we reached the leaf"

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u said that this is correct:

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https://i.imgur.com/pluJZIF.png

Imgur

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but with "first move forward", u get a different movement

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i dont mind how we do it

languid lava Aug 18, 2023, 7:36 AM

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velvet bay i'm having a hard time comprehending why right is more important than forward

It's a primitive maze strategy "stick to the wall"

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If you don't look to the right, you won't be able to stick to the right wall

jolly flare Aug 18, 2023, 7:37 AM

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if u first move forward, u get this

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and will be stuck

velvet bay Aug 18, 2023, 7:37 AM

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Ah I understand that

jolly flare Aug 18, 2023, 7:37 AM

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https://i.imgur.com/M2GG4v7.png

Imgur

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u can also see nicely here how to approach algorithms like this

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u have to solve it on paper first

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without thinking about code

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exercise it step by step on paper

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as seen in those pics

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before attempting to code anything

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alright. did u get the logic with the continue fully?

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would u be able to put the next piece at the right place already?

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while (!onLeaf()) {
  if (!treeRight()) {
    turnRight();
    move();
    continue;
  }

  ...
}

velvet bay Aug 18, 2023, 7:41 AM

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I understand that function is over and continues with next

jolly flare Aug 18, 2023, 7:42 AM

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so can u put the next piece in the code, or dont u fully understand it yet?

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is sth unclear?

velvet bay Aug 18, 2023, 7:42 AM

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while (treeRight()) {
move();

jolly flare Aug 18, 2023, 7:42 AM

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that doesnt look like it makes sense to me

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whats the next piece on the list, logic-wise?

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our list was:

move right if possible, if not:
move forward if possible, if not:
move left if possible, if not:
move back

velvet bay Aug 18, 2023, 7:44 AM

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is not possible 2. is with what i wrote

jolly flare Aug 18, 2023, 7:44 AM

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the task is to move one tile

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not multiple

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we are still doing only a single step

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while (!onLeaf()) {
  if (!treeRight()) {
    turnRight();
    move();
    continue;
  }

  ... // <- we are here
}

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okay, lets maybe introduce a helper method to clear ur confusion

velvet bay Aug 18, 2023, 7:45 AM

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if (!treeFront()) { move(); ?

jolly flare Aug 18, 2023, 7:45 AM

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u said u know how to create a simple void method

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so lets do that

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public static void moveOneStep() {
  ...
}

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we will write this method

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and then our core logic looks like this:

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while (!onLeaf()) {
  moveOneStep();
}

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and thats it

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alright?

velvet bay Aug 18, 2023, 7:48 AM

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hows this? void claraMove() {
while (!onLeaf()) {
move();

jolly flare Aug 18, 2023, 7:48 AM

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nope

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then u just move forward

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and nothing else

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whats unclear about what i just said?

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i dont have the feeling that ur really sticking with me for this

velvet bay Aug 18, 2023, 7:50 AM

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i'm confused as to what to do after the continue statement

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sorry

jolly flare Aug 18, 2023, 7:50 AM

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but thats not what we are doing now

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ur rushing ahead

velvet bay Aug 18, 2023, 7:50 AM

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we're creating a void statement for that

jolly flare Aug 18, 2023, 7:50 AM

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we were here: https://i.imgur.com/46A4nB6.png

Imgur

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and nothing else

velvet bay Aug 18, 2023, 7:50 AM

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oh nothing else

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my bad i didnt understand that

jolly flare Aug 18, 2023, 7:50 AM

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nothing else yet

velvet bay Aug 18, 2023, 7:50 AM

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ok same page now

jolly flare Aug 18, 2023, 7:50 AM

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is this piece of code fully clear

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or is it unclear

velvet bay Aug 18, 2023, 7:50 AM

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yep

jolly flare Aug 18, 2023, 7:51 AM

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okay. then we can now talk about implementing the moveOneStep method

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can u describe in words what its supposed to do

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whats the goal for this method

velvet bay Aug 18, 2023, 7:51 AM

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the goal of this is to get the bettle to move forward

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if its not a leaf (which it isnt until the end)

jolly flare Aug 18, 2023, 7:52 AM

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well, thats the overall context

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but not what this particular method would do

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the method doesnt deal with leaves at all

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thats done above the method

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please be a bit more precise

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try again 🙂

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lets say we stare at this picture:

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https://i.imgur.com/i47BOUQ.png

Imgur

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if we just call moveOneStep(); without anything else, just once

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where is the beetle supposed to be after that?

velvet bay Aug 18, 2023, 7:55 AM

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jolly flare Aug 18, 2023, 7:55 AM

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nope

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but i feel like we are now getting to ur misunderstanding

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so thats good

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look at the name of our method

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maybe u can deduct it from there

velvet bay Aug 18, 2023, 7:56 AM

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i have to use the statements listed in the top left of the original screenshot

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so i can't make the moveonestep statement

jolly flare Aug 18, 2023, 7:56 AM

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its a helper function

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why cant u introduce another function

velvet bay Aug 18, 2023, 7:56 AM

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you can only use a mix of the listed functions

jolly flare Aug 18, 2023, 7:56 AM

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or create ur own methods

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next to it

velvet bay Aug 18, 2023, 7:57 AM

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you can create your own method but only using the existing functions

jolly flare Aug 18, 2023, 7:57 AM

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yeah, but we will do that

velvet bay Aug 18, 2023, 7:57 AM

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the only available one is move();

jolly flare Aug 18, 2023, 7:57 AM

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nope

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moveOneStep() is a method we will write ourselves, which will use move() and other things

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class MyClara extends Clara {
  void run() {
    while (!onLeaf()) {
      moveOneStep();
    }
  }

  void moveOneStep() {
    ...
  }
}

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or are u not familiar with writing ur own methods yet?

velvet bay Aug 18, 2023, 7:59 AM

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while (!onLeaf())

jolly flare Aug 18, 2023, 7:59 AM

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yes, my bad

velvet bay Aug 18, 2023, 7:59 AM

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i mean I don't understand what statement would make me only one move if (treeleft && treeright??)

jolly flare Aug 18, 2023, 7:59 AM

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what do u mean

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move() moves a single tile

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not all the way forward until bonk

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does it

velvet bay Aug 18, 2023, 8:00 AM

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yes move would work

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i agree

jolly flare Aug 18, 2023, 8:00 AM

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but thats not including the turn logic yet

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ur rushing ahead again

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the point was that we introduce a helper method where we will move most of our logic into

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class MyClara extends Clara {
  void run() {
    while (!onLeaf()) {
      moveOneStep();
    }
  }

  void moveOneStep() {
    ...
  }
}

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so that the core logic is simple to understand

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especially for u, so that u dont get confused

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if helper methods confuse u, we can get rid of it again

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i thought it will simplify it for u. but im not so sure anymore now

velvet bay Aug 18, 2023, 8:02 AM

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i'm going to work on it alone, write it down on some paper and break it down - i have to go now - sorry for finding an understanding

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thanks for your help

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really appreciate it

jolly flare Aug 18, 2023, 8:02 AM

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mh. alright

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cat_thumbs_up

#move beetle to leaf