JavaScript provides several ways to check if a variable is a string. One of the most common methods is to use the typeof operator, which returns the type of a variable. For example, the following code checks if a variable named “myVar” is a string: if (typeof myVar === "string")...
How to find the single or multiple paragraphs which have the required word or string. How to find if a word or a substring is present in the given string? In this case, we will use the includes() method which determines whether a string contains the specified word or a substring. If ...
Checking if a variable is an array in JavaScript is one of the most common tasks you may encounter while building a Javascript-based application. There are several ways to perform this check, each with its pros and cons. In this post, we'll review three ways to determine if a variable ...
if(typeofv ==="undefined") {// no variable "v" is defined in the current scope// *or* some variable v exists and has been assigned the value undefined}else{// some variable (global or local) "v" is defined in the current scope// *and* it contains a value other than undefined...
Here, since our first-string variablestr_1contains all the uppercase valuesAB% ^M. Therefore, it has printed all the characters are in uppercase. Note that there is a space character inside this string as well. Inside the second string variablestr_2, from all the charactersIO(|12c, we ...
Then we have checked the constructor property of array and string usingarr.constructor === Arrayandstr.constructor === Array;and stored this result inres1andres2respectively. Example Here is a complete example code implementing above mentioned steps to check if a variable is an array in JavaScr...
Here we take an undefined variable name and compare it with void 0. This method also throws an error if we try to compare a variable that is not declared.Use the typeof Operator to Check Undefined in JavaScriptThis operator returns a string that tells about the type of the operand. If ...
Vue Js Check if a Variable is an Array: In Vue.js, you can use the Array.isArray() method to check if a variable is an array or not. This method takes one parameter, which is the variable you want to check, and returns a boolean value. If the variabl
Here, we will check if the length of the variable “val” is zero or not. Example In this example, we will create an empty string stored in a variable “val”: varval=""; Then, we will use the length property in a conditional statement to check if the length of the variable is ...
Checking if String Is Primitive or ObjectA string literal is a primitive. You can check this using the custom isPrimitive() function: const foo = 'foo'; console.log(isPrimitive(foo)); // true When you use String() as a function (or wrapper around a primitive value), it coerces...