Checking a list of Strings(Array) as palindrome in JS [duplicate]

Question

Please solve my issue, I am going to check a list of strings as palindrome, if any of the string from the array is palindrome then it should display a result true, the result should be in string value not in Boolean value. I had tried so many times but it is not displaying the result; See my code below:-

function checkPry()
{
    var status = new Array();
    var wordList1 = document.getElementById("tk").value;
    var wordArray = new Array();
    wordArray = wordList1.split(" "); 
    var alength = wordArray.length; 
    for(var i=0; i <= alength; i++)
    {
        var str = wordArray[i];
        var chrlength = str.length;
        var lw = chrlength - 1;
        var chk = "";
        for(j=0; j<=chrlength; j++)
        {
            if(str.charAt(j) != str.charAt((lw - j)))
            {
                chk = "false";
                break;
            }
            else
            {
                chk = "true";
            }
        }
        if (chk == "true")
        {
            status[i] = "true";
        }
        else if (chk == "false")
        {
            status[i] = "false"
        }
    }
    var displayStr = status.toString();
    document.getElementById("show").innerHTML = displayStr;
}

like If I am giving the input value as [dalad radar jaijai rexem] then it should be give result as [true,true,false,false], Please help me in that; you can also check the fiddle below:--

http://jsfiddle.net/yePQ4/1/

Thanks!

scrblnrd3 · Accepted Answer · 2013-12-18 15:58:57Z

5

You just need to check if something reversed is the same

function reverse(s){
     return s.split("").reverse().join("");
}

function checkIsPalindrome(arr){
   var result=[];
   for(var i=0;i<arr.length;i++){
       result.push(arr[i]==reverse(arr[i]));
   }
   return result;
}

edited Dec 18, 2013 at 15:58

answered Dec 18, 2013 at 15:52

scrblnrd3

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5 Comments

N.P. SINGH Over a year ago

can you provide a fiddle for that, it's hard to understand

scrblnrd3 Over a year ago

jsfiddle.net/8pLFC

N.P. SINGH Over a year ago

thank you so much... it's very optimized code

N.P. SINGH Over a year ago

well the code is really good, but the issue is I am just beginner, and it's hard to understand it. can you provide me some instructions on my code, that where is the issue, why my logic is not working, see my code please. it will be a great help for me.

nanobash Over a year ago

Performance isn't as good as it is here stackoverflow.com/questions/22111507/how-to-write-palindrome

Dagg Nabbit · Accepted Answer · 2013-12-18 16:08:15Z

2

Just for fun, here's an alternate version of @scrblnrd3's answer that uses a regex to reverse the string instead of split/join.

function reverse(text) {
    return text.replace(/./g, function(c, i, s) { return s[s.length - 1 - i]; });
}

function checkIsPalindrome(arr) {
    var result = [];
    for (var i = 0; i < arr.length; i++) {
        result.push(arr[i] == reverse(arr[i]));
    }
    return result;
}

edited Dec 18, 2013 at 16:08

answered Dec 18, 2013 at 16:02

Dagg Nabbit

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2 Comments

N.P. SINGH Over a year ago

can you create a fiddle so I can understand how's it will be use, I am just a beginner in JS

Dagg Nabbit Over a year ago

jsfiddle.net/8pLFC/1 :p Please dont accept this answer though, scrblnrd3 deserves credit for it.

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