How do I number fields in records?

• 0
  People, hello everyone. Please help me solve one problem:
  
  There is a set of records in which one of the fields is filled with a digit. A record has a unique number in the number field and a pr field, which contains numbers, as well as another set of fields filled with something.
  for example (not all options, but an example of possible ones):
  I)
  1,2,4,5 - to do this - 1,2,3,4 (i.e. 4 becomes 3, and 5 becomes 4)
  or
  II)
  1,3,5 - to do this - 1,2,3 (i.e. 3 becomes 2, and 5 becomes 3)
  or
  III)
  1,4,5 - to do this - 1,2,3 (i.e. 4 became 2 and 5 became 3)
  or
  IV)
  2,4,5 - to do this - 1,2,3 (i.e. 2 became 1, and 4 became 2, and 5 became 3)
  
  Or more fully for i) the example above:
  number = 100 has pr = 1; the entry number = 101 has pr = 2; entry number = 223 has pr = 4; the entry number = 190 has pr = 5
  Should be:
  number = 100 has pr = 1; the entry number = 101 has pr = 2; entry number = 223 has pr = 3; the entry number = 190 has pr = 4
  
  Something I wrote beautifully too - the entries are not arranged in order as I wrote them in I) ... - I just displayed them like that.
  In fact, it is necessary to preserve the precedence of the numbers, to renumber them in a sequential row from one.

  JavaScript Anonymous, Mar 19, 2019

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2 Answers
• 0
  If I understand correctly, then you sort by id, if the array is unsorted, and you number them stupidly forycham (as far as I understand, these are objects).
  
  
  
  Edit:
  
  Because of the disgusting DevAB96 code, I'll write some normal code.
  
  

  const arr = [
  
      { number: 100, pr: 1 },
  
      { number: 101, pr: 2 },
  
      { number: 190, pr: 5 },
  
      { number: 223, pr: 4 }
  
  	];
  
    
  
    // если порядок оригинального массива нужно отсортировать,
  
    // то: arr.sort
  
    const sortedArr = [...arr].sort((el1, el2) => el1.pr - el2.pr);
  
    
  
    sortedArr.forEach((el, index) => {
  
      el.pr = index + 1;
  
    });
  
    
  
    console.log(arr);
  
    console.log(sortedArr);

  Lukas Carson

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• 0

  Something I wrote beautifully too

  
  
  Exactly, I even shed a bloody tear from emotion!
  
  
  
  I understand that the order does not matter, but I understood it from this fragment of beauty:
  
  

  entry number = 100 has pr = 1; the entry number = 101 has pr = 2; the entry number = 223 has pr = 4; the entry number = 190 has pr = 5
  
  Should be:
  
  the entry number = 100 has pr = 1; the entry number = 101 has pr = 2; record number = 223 has pr = 3; number = 190 has pr = 4

  
  
  You can do it like this:
  
  

  const numbered = records.map((el, index) => ({...el, pr: index + 1}) ) // numbered - новый массив с нужной нумерацией pr
  
  // если нужно изменить на месте, то через forEach изменить свойство pr

  Michael Kidd

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