38 lines
1.4 KiB
JavaScript
38 lines
1.4 KiB
JavaScript
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// Write a JavaScript function that checks whether a passed string is palindrome or not?
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function check_Palindrome(str_entry){
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// Change the string into lower case and remove all non-alphanumeric characters
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var cstr = str_entry.toLowerCase().replace(/[^a-zA-Z0-9]+/g,'');
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var ccount = 0;
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// Check whether the string is empty or not
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if(cstr==="") {
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alert("Nothing found!");
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return false;
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}
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// Check if the length of the string is even or odd
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if ((cstr.length) % 2 === 0) {
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ccount = (cstr.length) / 2;
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} else {
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// If the length of the string is 1 then it becomes a palindrome
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if (cstr.length === 1) {
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alert("Entry is a palindrome.");
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return true;
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} else {
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// If the length of the string is odd ignore middle character
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ccount = (cstr.length - 1) / 2;
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}
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}
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// Loop through to check the first character to the last character and then move next
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for (var x = 0; x < ccount; x++) {
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// Compare characters and drop them if they do not match
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if (cstr[x] != cstr.slice(-1-x)[0]) {
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alert("Entry is not a palindrome.");
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return false;
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}
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}
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alert("The entry is a palindrome.");
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return true;
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}
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check_Palindrome('madam');
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check_Palindrome('nurses run');
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check_Palindrome('fox');
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