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To convert a specified value to a double-precision floating-point number, use Convert.ToDouble() method.The following is our long value −long[] val = { 340, -200};Now convert it to Double.double result; result = Convert.ToDouble(val);Example Live Demousing System; public class Demo { public static void Main() { long[] val = { 340, -200}; double result; // long to double foreach (long number in val) { result = Convert.ToDouble(number); Console.WriteLine("Converted {0} value to {1}",number, result); } } }OutputConverted 340 value to 340 Converted -200 value to -200
To return the number of images in a document, use the images property in JavaScript.ExampleYou can try to run the following code to get the count of images −Live Demo var val = document.images.length; document.write("Number of images in the document: "+val);
Set a Hashtable collection and add some elements to it.Hashtable h = new Hashtable(); h.Add(1, "Sam"); h.Add(2, "Jack"); h.Add(3, "Andy"); h.Add(4, "Katie"); h.Add(5, "Beth"); h.Add(6, "Benjamin");Use the ContainsKey() method to check whether a key exists in a Hashtable or not.Let’s check for key 3. It returns True of the key is found.h.ContainsKey(3));Example Live Demousing System; using System.Collections; public class Demo { public static void Main() { Hashtable h = new Hashtable(); h.Add(1, "Sam"); h.Add(2, "Jack"); h.Add(3, "Andy"); h.Add(4, "Katie"); h.Add(5, "Beth"); ... Read More
To return the id of the first image, use the images property in JavaScript.ExampleYou can try to run the following code to return the id of the first image in a document −Live Demo var val = document.images.length; document.write("Number of images in the document: "+val); document.write("The id of the first image: "+document.images[0].id);
Clear a Hashtable, using the Clear() method in C#.The following is our Hashtable −Hashtable h = new Hashtable(); h.Add(1, "Amit"); h.Add(2, "Sachin"); h.Add(3, "Rahul");Use the clear method.h.Clear();If you will now try to display the Hashtable, nothing would get display since the Hashtable is empty.Example Live Demousing System; using System.Collections; public class Demo { public static void Main() { Hashtable h = new Hashtable(); h.Add(1, "Amit"); h.Add(2, "Sachin"); h.Add(3, "Rahul"); Console.WriteLine("Keys and Values list:"); foreach (var key in h.Keys ) { ... Read More
The following is our Dictionary with some elements −Dictionary d = new Dictionary() { {1,"Electronics"}, {2, "Clothing"}, {3,"Toys"}, {4,"Footwear"}, {5, "Accessories"} };Now to display the first element, set the key like this.d[1];The above displays the first element.Example Live Demousing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary d = new Dictionary() { {1,"Electronics"}, {2, "Clothing"}, {3,"Toys"}, {4,"Footwear"}, {5, "Accessories"} }; foreach (KeyValuePair ele in d) { Console.WriteLine("Key = {0}, Value = {1}", ele.Key, ele.Value); } Console.WriteLine("First element: "+d[1]); } }OutputKey = 1, Value = Electronics Key = 2, Value = Clothing Key = 3, Value = Toys Key = 4, Value = Footwear Key = 5, Value = Accessories First element: Electronics
To return the "time" portion of the Date as a string, using the current locale's conventions, use the toLocaleTimeString() method.The toLocaleTimeString method relies on the underlying operating system in formatting dates. It converts the date to a string using the formatting convention of the operating system where the script is running. For example, in the United States, the month appears before the date (04/15/98), whereas in Germany, the date appears before the month (15.04.98).ExampleYou can try to run the following code to return the “time” portion of the Date as a string − JavaScript toLocaleTimeString ... Read More
To handle empty collections, use the DefaultIfEmpty() method in C#.If an array is empty, then using this method will show the default method instead of displaying an error.Let’s say we have an empty list.List myList = new List();Now, use DefaultIfEmpty() method to display the default value.myList.DefaultIfEmpty();Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo { static void Main() { List myList = new List(); var res = myList.DefaultIfEmpty(); foreach (var a in res) { Console.WriteLine(a); } } }Output0
JavaScript date setUTCSeconds() method sets the seconds for a specified date according to universal time.The following are the parameters for setUTCSeconds(secondsValue[, msValue]) methodLsecondsValue − An integer between 0 and 59, representing the seconds.msValue − A number between 0 and 999, representing the milliseconds.ExampleYou can try to run the following code to set seconds for a specified date − JavaScript setUTCSeconds Method var dt = new Date( "Aug 28, 2008 13:30:00" ); dt.setUTCSeconds( 65 ); document.write( dt );
Set a sequence and add elements.List ID = new List { 120, 111, 250, 111, 120, 300, 399, 450 };Use Distinct() method to get distinct element from the above list.IEnumerable res = ID.AsQueryable().Distinct();Let us see the complete code.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo { static void Main() { List ID = new List { 120, 111, 250, 111, 120, 300, 399, 450 }; // get distinct elements IEnumerable res = ID.AsQueryable().Distinct(); foreach (int arr in res) { Console.WriteLine(arr); } } }Output120 111 250 300 399 450