Checking if a String is Literal or Object JavaScript provides tools to distinguish between string literals and objects. Here are some approaches: Function check(str) instanceof check: if (str instanceof String) Checks if str is an instance of the String constructor. This will return true for...
Below is an example to find if the string is a palindrome using JavaScript String and Array Methods ? Open Compiler // Function to check for Palindrome function isPalindrome(str) { const lowerCaseStr = str.toLowerCase(); const modifiedStr = lowerCaseStr.replace(/[\W_]/g, ''); const re...
In JavaScript, the typeof operator is the most used method to check the type of any variable. Alternatively, you can use the typeof() method: let myString = 'John Doe'; typeof myString; // string typeof(myString); // string If used with a string, the typeof operator returns "...
Check if First Letter Is Upper Case in JavaScript We can check if the first of a letter a string is upper case in a few ways. Let's take a look at some popular ones. toUpperCase() This is a built-in string method that returns the invoked string with only upper case characters: func...
str3 = new String('Great Place'); Now to check whether a given variable is a string or not, we'll use a JavaScript operator calledtypeof. Syntax: typeof variable; This operator returns the data type of the variable specified after it. If the variable is of string data type, it will...
JavaScript provides several ways to check if a variable is a string. One of the most common methods is to use thetypeofoperator, which returns the type of a variable. For example, the following code checks if a variable named “myVar” is a string: ...
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....
JavaScript Code: // Define a function 'isLowerCase' that checks if the given string 'str' contains only lowercase lettersconstisLowerCase=str=>// Check if the given string 'str' is equal to its lowercase versionstr===str.toLowerCase();// Test cases to check if the strings contain only ...
Write a JavaScript function to check whether a string is blank or not.Test Data : console.log(is_Blank('')); console.log(is_Blank('abc')); true falseVisual Presentation:Sample Solution:JavaScript Code:// Define a function called is_Blank that checks if the input string is blank is_...
Hi, I m getting results from a search engine. I am doing some processing on these results and I need to check if the results(i.e the urls are valid for...