In this tutorial, we will give you three examples of how to check if a string is empty or null by using plain JavaScript, React, and Vue. We will also explain the differences and similarities between these frameworks and how they handle empty or null strings....
if(string_name.length === 0){ // string is empty } ExampleBelow is the example code given, that shows how to use the length property to check the empty string.Open Compiler <html> <body> <script> var str = ''; if(str.length === 0){ document.write('String is empty'); } <...
Function check(str) instanceof check: if (str instanceof String) Checks if str is an instance of the String constructor. This will return true for objects created using new String(). typeof check: if (typeof str === "string") Checks if str is of type "string", which applies to str...
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...
So just using the Object.keys, it does return true when the object is empty ✅. But what happens when we create a new object instance using these other constructors.function badEmptyCheck(value) { return Object.keys(value).length === 0; } badEmptyCheck(new String()); // true 😱...
check if a string contains substring in Javascript 6.Javascript String Contains Case-insensitive check To check for case-insensitive Javascript string contains, use the below methods. The simplest way is to convert the entire string to either to lowercase or uppercase and use the javascrip...
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 "...
TheJSON.stringifymethod is used to convert a JavaScript object to a JSON string. So we can use it to convert an object to a string, and we can compare the result with{}to check if the given object is empty. Let’s go through the following example. ...
if(typeofmyVar==="string"){console.log("myVar is a string");}else{console.log("myVar is not a string");} Another way to check if a variable is a string is to use theinstanceofoperator, which returns true if an object is an instance of a particular constructor. For example, the ...
A common operation in many programming languages is to check if a string contains another string. While it's a simple and common task, the method names often differ between programming languages. For example, here is a small sample of the methods used to achieve this in various languages: ...