While writing a program or any script or any piece of frontend code in Javascript, if you want to check if an array is empty or not, you can use the length property of arrays in Javascript. The length property of the array returns the count of the number of elements stored in the ...
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...
Step 1: We have to find out if the given string is a palindrome or not. So to do this task we will create a function called isPalindrome and in this function, we will pass a parameter of string as str. So for this str, we will check the palindrome condition. Step 2: After the...
If the JavaScript array contains no such values or items, the methodreturns -1. The JavaScriptArray.indexOf()starts checking a JS array from the start and stops at the end of the array. But users can also add the starting index as the second parameter to start the check from a particula...
Theincludes()function of JavaScript checks whether a given element is present in an array. It returns a boolean value. Hence, it is best suited inifcondition checks. Syntax includes(keyword)includes(keyword,index) Parameter The function takes two parameters. Usually, we use this function in the...
Calendar.SelectedDate - Is selected? call a javascript function if a required field validator fails call a page load event from another code behind Call a Postback in a JavaScript function Call a stored procedure with parameter in c# and MySQL Call code behind function using anchor tag call fu...
First, we define a function "isOdd()" that takes a parameter 'num' of type number. Inside the function, we use a type guard (typeof num === "number" && isFinite(num)) to check if num is both of type number and a finite number (not NaN, Infinity, or -Infinity). ...
Anyway, let's see a few of the ways in which you can check if a string contains a substring in JavaScript. Note: The first two methods shown below also work on arrays, which tells you if an array contains a given value (or the index of it for indexOf()). Keep this in mind when...
How do you check if every value of a JavaScript array is equal? JavaScript’s allEqual() function allows you to check every value of an array and determine if it is equal. It’ll return true if the values are equal and false if they aren’t equal. Here are two sample results from ...
JavaScript Code: // Define a JavaScript function called is_weekend with parameter date1varis_weekend=function(date1){// Create a new Date object by parsing the provided date stringvardt=newDate(date1);// Check if the day of the week is Saturday (6) or Sunday (0)if(dt.getDay()==6|...