trim() === ''){ document.write('String is empty'); } Following is the output of the above program −String is empty So, we have seen how to check the empty string in JavaScript using the length property and trim() method. Print Page Previous Next ...
How do you check if one string contains a substring in JavaScript?Craig Buckler
JavaScript offers many ways to check if a string contains a substring. Learn the canonical way, and also find out all the options you have, using plain JavaScriptChecking if a string contains a substring is one of the most common tasks in any programming language....
An offset of below 0 just starts the search from index 0, and an offset greater than string.length returns false since the search starts from string.length. The String.indexOf() Method The String.indexOf() method is much like the previous includes() method (and it's suitable to be used...
In JavaScript, includes() method checks whether a sub-string or a character is present in the string or not. It will return output in terms of true and false. This method is case sensitive, which means that it will consider uppercase and lowercase differently....
String.prototype.includes) { Object.defineProperty(String.prototype, 'includes', { value: function(substring, searchposition) { if (typeof searchposition!== 'number') { searchposition= 0 } if (searchposition+ substring.length > this.length) { return false } else { return this.indexOf...
The other pointer at the end of the string ? let right = cleanedStr.length - 1; Move the pointers inward, checking for character equality ? while (left < right) { left++; right--; } Example Below is an example to find if the string is a palindrome using the Two-Pointer Technique ...
Another method to check if a string is a palindrome or not is by using aforloop. Below are the steps to check if a string is a palindrome in JavaScript. functionpalindromeFn(string){conststringLength=string.length;for(leti=0;i<stringLength/2;i++){if(string[i]!==string[stringLength-1...
alert(search + ' was found inside the string: ' + string); } In the JavaScript snippet above, we searched our string for the substring “ello”. We did this by using theindexOf()method. If the given search term is not found within the string, the indexOf method will return a -1 ...
JavaScript Code: // Define a function named 'test' that checks if a given string is a palindromeconsttest=(text)=>{// Check if the input is not a stringif(typeoftext!=='string'){return'String should not be empty!';}// Check if the length of the string is less than or equal to...