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check for palindromes

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Ernest Adonu answered on August 17, 2020 Popularity 10/10 Helpfulness 2/10

answer check for palindromes

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check for palindromes

Comment

function palindrome(str) {
  var re = /[\W_]/g;// representing Non-alphanumetic characters
  var lowRegStr = str.toLowerCase().replace(re, '');
  var reverseStr = lowRegStr.split('').reverse().join(''); 
  return reverseStr === lowRegStr;
}
palindrome("A man, a plan, a canal. Panama");

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript

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Contributed on Mar 25 2022

Ernest Adonu

0 Answers Avg Quality 2/10

Closely Related Answers

Palindrome Checker

Comment

/*
	C++ Palindrome Checker program by lolman_ks.
    Checks palindromic string WITHOUT reversing it.
    Same logic can be used to build this program in other languages.
*/
  
 /*
	 Logic: In a palindromic string, the 1st and last, 2nd and 2nd last, and so
     on characters are equal.
     Return false from the function if any of these matches, i.e (1st and last),
     (2nd and 2nd last) are not equal.
 */

#include <iostream>
using namespace std;

bool checkPalindromicString(string text){
  int counter_1 = 0; //Place one counter at the start.
  int counter_2 = text.length() - 1; //And the other at the end.

  //Run a loop till counter_2 is not less that counter_1.
  
  while(counter_2 >= counter_1){
    if(text[counter_1] != text[counter_2]) return false; //Check for match.
    //Note: Execution of a function is halted as soon as a value is returned.
    
    else{
      ++counter_1; //Move the first counter one place ahead.
      --counter_2; //Move the second character one place back.
    }
  }
  return true; 
  /*
  	Return true if the loop is not broken because of unequal characters and it
    runs till the end.
    If the loop runs till the condition specified in it, i.e 
    (counter_2 >= counter1), that means all matches are equal and the string is 
    palindromic.
  */
}

//Implementation of the function.

int main(){
  cout << checkPalindromicString("racecar") << endl; //Outputs 1 (true).
  cout << checkPalindromicString("text") << endl; //Outputs 0 (False).
  
  if(checkPalindromicString("lol")){
  	cout << "#lolman_ks";
  }
  //Outputs #lolman_ks.
  
  return 0;
}

//I hope this would be useful to you all, please promote this answer if it is.
//#lolman_ks

Popularity 10/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Mar 04 2022

LOLMAN_KS

0 Answers Avg Quality 2/10

Palindrome check

Comment

bool isPalindrom(string str){
    for (int i = 0; i < str.length(); i++)
       if(str[i]!=str[str.length()-i]) return false;
    return true;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Sep 26 2023

Shishir Bhuiyan

0 Answers Avg Quality 2/10

Palindrome Checker

Comment

// The Setup
function palindrome(str) {

  // Using Regex to remove all the special character, converted all the string to lowercase to ease working with and assign it to a new variable 
  let newStr = str.replace(/[^a-zA-Z0-9]/g, '').toLowerCase();

  // Split the string, reverse, join then assign it to a new variable
  let revStr = newStr.split('').reverse().join('');

  // return their value
  return newStr === revStr;

}

palindrome("A man, a plan, a canal. Panama");

Popularity 7/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript palindrome p

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Contributed on Jul 23 2022

Taiwo Jazz

0 Answers Avg Quality 2/10

Palindrome Checker

Comment

const palindrome = str = {
  str = str.replace(/[\W+|_]/g, '').toLowerCase()
  
  const str1 = str.split('').reverse().join('')

  return str1 === str
}

palindrome("My age is 0, 0 si ega ym.");

// With love @kouqhar

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.linkedin.com

Tags: javascript j

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Contributed on Feb 27 2021

kouqhar

0 Answers Avg Quality 2/10

fastest way to check a number is palindrome

Comment

function palindromeNumber(num) {
  	let numStr = num.toString();
    return numStr === numStr.toString().split("").reverse().join("");
}

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 28 2022

ofroog

0 Answers Avg Quality 2/10

check if palindrome

Comment

function isPalindrome(str) {
  str = str.toLowerCase();
  return str === str.split("").reverse().join("");
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 17 2020

Fylls

0 Answers Avg Quality 2/10

check if string is a palindrome

Comment

<script>
  // function that check str is palindrome or not
  function check_palindrome( str )
  {
    let j = str.length -1;
    for( let i = 0 ; i < j/2 ;i++)
    {
      let x = str[i] ;//forward character
      let y = str[j-i];//backward character
      if( x != y)
      {
        // return false if string not match
        return false;
      }
    }
    /// return true if string is palindrome
    return true;
     
  }
 
  //function that print output is string is palindrome
  function is_palindrome( str )
  {
    // variable that is true if string is palindrome
    let ans = check_palindrome(str);
    //condition checking ans is true or not
    if( ans == true )
    {
      console.log("passed string is palindrome ");
    }
    else
    {
      console.log("passed string not a palindrome");
    }
  }
  // test variable
  let test = "racecar";
  is_palindrome(test);
</script>

Popularity 9/10 Helpfulness 2/10 Language whatever

Source: www.geeksforgeeks.org

Tags: palindrome p

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Contributed on Sep 21 2022

Maliha Jamil

0 Answers Avg Quality 2/10

Checking String Palindrome

Comment

int main()
{
    char str1[20], str2[20];
    int i, j, len = 0, flag = 0;
    cout << "Enter the string : ";
    gets(str1);
    len = strlen(str1) - 1;
    for (i = len, j = 0; i >= 0 ; i--, j++)
        str2[j] = str1[i];
    if (strcmp(str1, str2))
        flag = 1;
    if (flag == 1)
        cout << str1 << " is not a palindrome";
    else
        cout << str1 << " is a palindrome";
    return 0;
}

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: www.sanfoundry.com

Tags: palindrome p

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Contributed on Jul 17 2022

Bewildered Bug

0 Answers Avg Quality 2/10

Checking String Palindrome

Comment

int main()
{
    char str1[20], str2[20];
    int i, j, len = 0, flag = 0;
    cout << "Enter the string : ";
    gets(str1);
    len = strlen(str1) - 1;
    for (i = len, j = 0; i >= 0 ; i--, j++)
        str2[j] = str1[i];
    if (strcmp(str1, str2))
        flag = 1;
    if (flag == 1)
        cout << str1 << " is not a palindrome";
    else
        cout << str1 << " is a palindrome";
    return 0;
}

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: www.sanfoundry.com

Tags: palindrome p

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Contributed on Jul 17 2022

Bewildered Bug

0 Answers Avg Quality 2/10

check for palindromes

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