Check if control exists in page Check if FileUpload control is empty Check if iFrame Is Fully Loaded check if parameter exist check if the checkbox is checked check keyvaluepair present in list Check session if doesn't exists redirect to login page Check username and password is incorrect in...
Parameter name: newDisplayMember C# - Changing Console Font Programmatically C# - check if program with same name is running C# - Convert.ToString() V.S. (string) - Feel a bit confused C# - Copy hard drive Sector by Sector C# - Error while adding Data Header column in data table C# - ...
Conclusion Now you know all about the four methods to check if a file exists using NodeJS. It’s recommended to usefs.existsSync()if you only need to check for the existence of a file. When you need to check for specific permissions as well, you can use eitherfs.accessSync()orfs.acce...
} else { // The property exists console.log(myObj.welcome); }Run > Reset The hasOwnProperty MethodJavascript object provides the hasOwnProperty native method. The method returns a boolean indicating if the object has the specified property as a first parameter.The...
The code block below demonstrates how to check if a file exists using the Dir() function. The Dir() function is a powerful tool to get folder names and file names by using their file paths. The code block below contains a subroutine with a fileToCheck parameter. You can call the Check...
JavaScript Copy The parameter value will be true when the file exists otherwise it'll be false. Using accessSync method The accessSync method is used to verify the user’s permission for the specified path. If the path is not found, it will throw an error that we need to handle using ...
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...
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|...
JavaScript Code: // Define a function named first_last_1 with a parameter numsfunctionfirst_last_1(nums){// Calculate the index of the last element in the arrayvarend_pos=nums.length-1;// Check if the first or last element in the array is equal to 1, and return the resultreturnnums...