Longest Repeating Character In String - Javascript

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I'm ultimately trying to solve this challenge on codewars.

I know how to find out how many times a character appears in a string, but not how many times it appears in order.

I.e. given the string bbbaaabaaaa, we see that the longest repeating character is a of length 4.

I tried a simple for-loop, comparing characters to previous characters to see if they're identical:

function longestRepetition (str) {
  let longestChunk = '';
  for (let i = 0; i < str.length; i++) {
    let chunk = '';
    if (i === 0) {
      if (str[i] === str[i + 1]) {
        chunk += str[i];
      }
    }
    if (i > 0) {
      if (str[i] === str[i - 1]) {
        chunk += str[i];
        console.log('chunk**', chunk);
      }
      if (chunk.length > longestChunk.length) {
        longest = chunk;
      }
    }
  }
  return longestChunk;
}

console.log(longestRepetition('bbbaaabaaaa'));

Here is my solution:

function longestRepetition (str) {
  if (str.length === 0) {
     return ['', 0]
  }
  let longest = '';
  let chunk = '';
  for (let i = 0; i < str.length; i++) {
    if (i === 0) {
      if (str[i] === str[i + 1]) {
        chunk += str[i];
      }
    }
    if (i > 0) {
      if (str[i] === str[i - 1]) {
        chunk += str[i];
        console.log('chunk**', chunk);
      }
      if (str[i] !== str[i - 1]) {
        chunk = str[i];
      }
      if (chunk.length > longest.length) {
        longest = chunk;
      }
    }
  }
  return [longest[0], longest.length];
}

Longest Substring JavaScript, Longest Substring JavaScript - LeetCode Solution. longest-substring.js. // Given a string, find the length of the longest substring without repeating characters. The basic idea is to find the longest repeating suffix for all prefixes in the string str. Length of longest non-repeating substring can be recursively defined as below. LCSRe (i, j) stores length of the matching and non-overlapping substrings ending with i'th and j'th characters.

You can simply use a regular expression to find the longest matching single letter sequence:

str.match(/(.)\1*/g).sort((a,b)=>b.length-a.length)[0]

Just play around with the following fiddle:

document.querySelector('#test').addEventListener('keyup',function(ev){
 var res=(ev.target.value.match(/(.)\1*/g)||['']).sort((a,b)=>b.length-a.length)[0];
 document.querySelector('#out').innerText=JSON.stringify([res[0],res.length]);
});
<input size="40" type="text" id="test" value="aaaabbbbbbbccddddzfffffklxxxaavvvv"><br>
<div id="out"></div>

JavaScript function: Find longest substring in a given a string without , JavaScript: Find longest substring in a given a string without repeating characters​. Last update on February 26 2020 08:09:06 (UTC/GMT +8  The problems asks "given a string, find the longest non-repeating sub-string without repeating characters". I am a little stumped why returning my code is not working for the string "dvdf" for example. Here is my code :

You could solve this by using reduce on an array from your string:

function longestRepetition(s) {
  const reducer = (acc, value) => {
    acc.count = acc.last === value
      ? acc.count + 1
      : 1;
    acc.last = value;
    acc.result = acc.count > acc.result.count
      ? { count: acc.count, char: value }
      : acc.result;
    return acc;
  }
  const initAcc = {
    result: {
      char: '',
      count: 0
    }
  }
  const { result } = s.split('').reduce(reducer, initAcc);
  
  return [result.char, result.count];
}

console.log(longestRepetition('aaabbbabbaaaabba'));

Find The Length of the Longest Substring Without Repeating, Tagged with javascript, algorithms, leetcode. Once we hit a repeated character, we should return the length of the characters before we hit  Given a string, the task is to find maximum consecutive repeating character in string. Note : We do not need to consider overall count, but the count of repeating that appear at one place.

Longest Substring Without Repeating Characters in JS, Longest Substring Without Repeating Characters in JS · javascript algorithm programming-challenge ecmascript-6. The task. is taken from  Given a string str, find the length of the longest substring without repeating characters. For “ABDEFGABEF”, the longest substring are “BDEFGA” and “DEFGAB”, with length 6. For “BBBB” the longest substring is “B”, with length 1. For “GEEKSFORGEEKS”, there are two longest substrings shown in the below diagrams, with length 7

Maximum consecutive repeating character in string, Note : We do not need to consider overall count, but the count of repeating that appear at one place. Examples: Input : str = "geeekk" Output : e Input : str = "  These days, the repeat string method is implemented almost everywhere. (It is not in Internet Explorer.)So unless you need to support older browsers, you can simply write: "a".repeat(10)

Length of the longest substring without repeating characters , // with all distinct characters. int longestUniqueSubsttr(string str). {. int n = str. Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Comments
  • Your set chunk to an empty string at the beginning of every loop iteration
  • 1. you reset chunk at each iteration so it won't increase much. 2. you make a special if case in the for loop. If really necessary, do it outside and start your for loop at i=1. 3. you return a string but spec says only length needed. 4. no need to increment every time just keep track of startingSequenceIndex and when sequence is broken, do the substraction. 5.no need to compare [i] with [i+1], just compare [i] with c (the character given in spec)
  • You should only empty chunk when the character is different from the previous.
  • Another strategy: github.com/khaled301/js-excercise-code/blob/leet-code/…
  • My hint woudl be using a Map object as accumulator and .reduce() function.
  • I don't think it will work much because generally those tests are somehow strict performance wise (O(n) expected I'd guess). I am upvoting for the conciseness though :)
  • Hey guys, don't get too uptight. I am well beyond your "test"-phase. This tiny bit of code works. I am not running it on string with length>1000000 ... :D :D
  • If possible, please add a reason for the downvote, so I can improve this and my future answers. Thank you.