How to split a string with consecutive uppercase and lowercase letters (to get the number atoms of a molecule)?

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I am trying to play with an algorithm where it requires me to read the number of atoms contained in an array, to which I have only began to test out the possibilities and to do so I am checking the uppercase letters and lowercase letters separately and trying to join them together afterwards, here's how I was trying:

function countAtoms(molecule) {
    var element = molecule;
    var newArray = [];
    console.log('Hello World');
    for (let i = 0; i < element.length; i++) {
        if(element[i] == element[i].toUpperCase()){
            var uppercase = element[i]+'1';
            newArray = uppercase;
            console.log(newArray);

        }
        else{
            var lowercase = element[i];
            newArray = lowercase;
            console.log(newArray)
        }
            

    }

}

You need to split the string into groups that start with uppercase letters. One succinct way to do this is with a regular expression:

let molecule = "NaCl"
let arr = molecule.match(/([A-Z][a-z]*)/g) // match uppercase letter followed by 0 or more lower case letters
console.log(arr)

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You can use the below regex to split the items along with their atom count. This works even with molecules like H2SO4, H2O etc.

const molecule = "H2SO4",
      arr = molecule.match(/[A-Z][a-z]*\d?/g),
      mappedArray = arr.map(a => /\d/g.test(a) ? a : a+1),
      joinedString = mappedArray.join('');
      
console.log(mappedArray)
console.log(joinedString)

Remove consecutive alphabets which are in same case , Given a string str, the task is to remove consecutive characters from the string that are in same case (Uppercase or Lowercase) and print the resultant string. int main(). {. string s = "GeeksForGeeks" ;. cout << removeChars(s);. return 0;. } Please Improve this article if you find anything incorrect by clicking on the "​Improve  Python Regular Expression: Exercise-43 with Solution. Write a Python program to split a string at uppercase letters. Sample Solution:- . Python Code: import re text = "PythonTutorialAndExercises" print(re.findall('[A-Z][^A-Z]*', text))

there you have, using reduce and then looping over and object with all the sums :)

function countAtoms(molecule) {
  console.log('Hello World');
  const sums = molecule.reduce((sum, atomKey) => {
    const atom = atomKey.toUpperCase()
    if (!sum[atom]) sum[atom] = 0;
    sum[atom] += 1;
    return sum;
  }, {})

  let finalString = '';

  Object.keys(sums).forEach(sumKey => {
    finalString += sumKey + sums[sumKey];
  })

  return finalString;


}

const result = countAtoms(['NA', 'CA', 'H', 'H', 'NA', 'na']);
console.log(result)

Processing Procedures and Policies, Sequence is a list of the consecutive chemical components covalently linked in a The wwPDB encourages depositors to provide a smile string and/or chemical name 10 atoms, the residue will be split into two groups: the amino acid/​nucleotide Upper case letters and numbers (0-9) should be used first for chain IDs. Smallest and Largest N-digit number starting and ending with N; Count of substrings of length K with exactly K distinct characters; Split the string into minimum parts such that each part is in the another string; Find the element in a linked list with frequency at least N/3; Sum of decomposition values of all suffixes of an Array

To achieve expected result, use below option of making below changes to existing code

  1. newArray variable to empty string, var newArray = '';
  2. Concat everytime instead of over writing newArray variable, newArray += uppercase; and newArray += lowercase;

function countAtoms(molecule) {
    var element = molecule;
    var newArray = '';
    console.log('Hello World');
    for (let i = 0; i < element.length; i++) {
        if(element[i] == element[i].toUpperCase()){
            var uppercase = element[i]+'1';
            newArray += uppercase;
            console.log(newArray);

        }
        else{
            var lowercase = element[i];
            newArray += lowercase;
            console.log(newArray)
        }
            

    }

}

countAtoms('NaCl')

The Coot User Manual, 11.41.1 post-go-to-atom-window; 11.41.2 go-to-atom-molecule-number; 11.41.3 where key is a quoted string (note that upper case and lower case keys are Coot will look in the dictionary for the 3-letter code for the particular residue type, if it added) is split amongst the atoms that existed in the residue before the split. What is the pythonic way to split a string before the occurrences of a given set of characters?. For example, I want to split 'TheLongAndWindingRoad' at any occurrence of an uppercase letter (possibly except the first), and obtain ['The', 'Long', 'And', 'Winding', 'Road'].

Think Julia: How to Think Like a Computer Scientist, is a string, so called because the letters it contains are strung together. Chemists use a formal language to represent the chemical structure of molecules​. Dividing a long program into functions allows you to debug the parts one at Julia does not handle uppercase and lowercase letters the same way  Adding space in a specific position in a string of uppercase and lowercase letters. 1. Split a string based on upper case letters. 1. split a string on first

peer, Letters To Numbers · THEAP001. 0. 0 · ISS and Strings · BYCO1612. 0. 0 · Roman or Arabic · THEAP002. 0. 0 · The Great Circus · ICL16P. 0. 0 · Juggler · ICL16Q. Q. Convert string into uppercase & lowercase using character function. Solution: In this program, the string is converting into upper and lower case using character function toupper and tolower. To use this function in program, it is mandatory to use header file ctype.h.

[PDF] Introduction to Python Programming, Find more on www.python.org (search for string methods). . 35 Split each line in the output of the command off 32.0 grams of oxygene molecules, you'll have 6.02214199 × 1023 of them. imal number of consecutive occurrences tract 97 from the character code of a lowercase letter, we therefore get the let- ter's rank  I think this is an easy question, but I am not able to find a simple solution (say, less than 10 lines of code :) I have a String such as "thisIsMyString" and I need to convert it to a String[] {"

Comments
  • What are you passing into the function? What is the definition of molecule?
  • im passing exactly like this: countAtoms('NaCl'); the definition of molecule is literal, i would say. The algorithm requires me to verify how many molecules a certain chemical element passed as argument has and return the result, and i was trying to concat them doing var res = uppercase.concat(lowercase) hence the result getting printed as described above
  • So, given the input of NaCl, what are you expecting the outcome to be?
  • Im trying to figure out how to join the strings, as i was saying for now i managed to identify the amount of molecules in each element in this case, which is 1 Na and 1 Cl, what i wanna do now is not only make it Na1Cl1, but i also want to reverse it to Cl1Na1
  • Can the input be like H2O and H2SO4?
  • yep, it looks exactly like what i was aiming for
  • This doesn't appear to handle a molecule like H2SO4
  • That's not part of the question (or it wasn't when I wrote the answer) @IanMcLaird. It looks like the OP is doing this one step at a time. For all we know the "atoms contained in an array" may be like ['H', 'H', 'S', 'O', 'O', 'O', 'O']