Nested for loop through json object array does not work

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• Calculation between vectors in nested for loops

  I am struggling with an issue concerned with nested for loops and calculation with conditions.

  Let's say I have a data frame like this:

  df = data.frame("a" = c(2, 3, 3, 4), 
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  With this df, I want to compare each element between vectors with a condition: if the absolute difference between two elements is lower than 2 (so difference of 0 and 1), I'd like to accord 1 in a newly created vector while the absolute difference between two elements is >= 2, I'd like to append 0.

  For example, for a calculation between the vector "a" and the other vectors "b", "c", "d", I want this result: 0 0 1. The first 0 is accorded based on the difference of 2 between a1 and b1; the second 0 is based on the difference of 3 between a1 and c1; the 1 is based on the difference of a1 and d1. So I tried to make a nested for loop to applicate the same itinerary to the elements in the following rows as well.

  So my first trial was like this:

  list_all = list(df$a, df$b, df$c, df$d)
  
  v0<-c()
  
  for (i in list_all)
    for (j in list_all)
      if (i != j) {
        if(abs(i-j)<2) { 
          v0<-c(v0, 1) 
        } else { 
          v0<-append(v0, 0)
        }} else { 
          next}
  

  The result is like this :

  v0
  [1] 0 0 1 0 1 1 0 1 0 1 1 0
  

  But it seems that the calculation has been made only among the first elements but not among the following elements.

  So my second trial was like this:

  list = list(df$b, df$c, df$d)
  
  v1<-c()
  
  for (i in df$a){
    for (j in list){
      if(abs(i-j)<2) { 
        v1<-append(v1, 1) 
      } else { 
        v1<-append(v1, 0)
      }
    }
  }
  v1 
  
  v1
  [1] 0 0 1 1 0 1 1 0 1 1 1 1
  

  It seems like the calculations were made between all elements of df$a and ONLY the first elements of the others. So this is not what I needed, either.

  When I put df$b instead of list in the nested for loop, the result is even more messy.

  v2<-c()
  
  for (i in df$a){
    for (j in df$b){
      if(abs(i-j)<2) { 
        v2<-append(v2, 1) 
      } else { 
        v2<-append(v2, 0)
      }
    }
  }
  v2     
   [1] 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1
  

  It seems like the calculation has not been made between the corresponding elements (in the same rows), but between all vectors regardless of the place.

  Could anyone tell me how to fix the problem? I don't understand why the nested for loop works only for the first elements.

  Thank you in advance.
• My for-loop that outputs a chessboard only works with even numbers, WHY?

  Write a program that creates a string that represents an 8×8 grid, using newline characters to separate lines. At each position of the grid there is either a space or a "#" character. The characters should form a chessboard.

  /* Passing this string to console.log should show something like this:
  
   # # # #
  # # # # 
   # # # #
  # # # # 
   # # # #
  # # # # 
   # # # #
  # # # #
  When you have a program that generates this pattern, define a binding size = 8 and change the program so that it works for any size, */
  

  outputting a grid of the given width and height.

  Here's my answer:

  let countPosition = 0, countLine = 0, size = 8, output = '';
  
  for (let i =0; i < size; i++) {
      for (let j = 0; j < size; j++) {
          if (countLine % 2 == 0) { 
  
              if (countPosition % 2 == 0) {
              output += " "; 
              }
              else {
              output += "#"; 
              } 
           } else {
               if (countPosition % 2 == 0) {
                   output += "#";
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               else {
                   output += ' ';
               } 
               
           } countPosition += 1;
          
      } countLine += 1;
        output += '\n';  
  }  
      
  
      console.log(output);
      console.log(countLine);

  My problem is that my code only works with even numbers!!!!! WHY???!! I have been stuck with this for a while I don't understand what's wrong with the code. It looks so logical why would it not work with odd numbers why? Any intellectual out there please explain this weird quirk.

  This is a problem from Eloquent JavaScript: (https://eloquentjavascript.net/02_program_structure.html#i_swb9JBtSQQ)

  (Edit: sorry for the weird formatting above, I couldn't get the chessboard to look okay without writing it as if it were a code snippet)