Found 10916 Articles for Web Development

What is Logical OR Operator (||) in JavaScript?

Updated on 08-Nov-2022 06:22:00
In this tutorial, we will discuss the logical OR (||) operator in JavaScript. The logical OR operator is used with a set of operands, and it will return true if any of those operands is true, else it returns false when all the operands are not true. If the logical OR operator is used with the Boolean values, it returns a Boolean value. Otherwise, if it is used with non-boolean values, it will return non-boolean values or the values of the operands that are true out of that set as they all must have values in binary form, 1 for ... Read More

How to use associative array/hashing in JavaScript?

Abhishek Kumar
Updated on 10-Nov-2022 08:43:54
We use Object and Map classes to mimic the behavior of associative array/hashing in JavaScript. JavaScript doesn’t provide an associative array built-in. The closest similar behavior we get is from the Map class in JavaScript. Let us look at them one by one. Object class in JavaScript The object class allows us to create objects with name-value pairs. This is similar to hashing as the object knows which property is associated with what value. Syntax const obj = { name : "Abhishek", age : 22 } var name = This creates an ... Read More

How to encode a URL using JavaScript function?

Shubham Vora
Updated on 23-Aug-2022 09:12:46
As we know, a URL is a web address. What is URL encodingand why do we need to encode a URL? The process of turning a string into an accurateURL format is known as URL encoding. A valid URL format only uses "alpha | digit | safe | extra | escape" characters. Only a limited selection of the normal 128 ASCII characters is permitted in URLs. It is required to encrypt reserved characters that are not part of this set. The reliability and security of the URLs are increased with URL encoding. Each character that needs to be URL-encoded is ... Read More

What is Logical NOT Operator (!) in JavaScript?

Rishi Rathor
Updated on 30-Sep-2019 08:51:59
The Logical NOT Operator reverses the logical state of its operand. If a condition is true, then the logical NOT operator will make it false.                    var a =true;          document.write("a = ");          document.write(a);          result =!a;          document.write("!a = ");          document.write(result);          

Why should we not use ++, -- operators in JavaScript?

Priya Pallavi
Updated on 19-Jun-2020 13:37:49
The increment (++) and decrement (---) operators should be avoided since it can lead to unexpected results. Here are some of the conditions −ExampleIn an assignment statement, it can lead to unfavorable results −Live Demo                                        var a = 5;                    var b = ++a;                    var c = a++;                    var d = ++c;                        document.write(a);                    document.write("\r"+b);                    document.write("\r"+c);                    document.write("\r"+d);                           OutputWhitespace between the operator and variable can also lead to unexpected results −a = b = c = 1; ++a ; b -- ; c;

How to decode a URL using JavaScript function?

Shubham Vora
Updated on 25-Oct-2022 09:06:43
In this tutorial, we will learn how to decode a URL using JavaScript. URL is an abbreviation for Uniform Resource Locator. A URL is the address of a certain Web site. Each valid URL, in principle, links to a different resource. These resources include an HTML page, a CSS document, a picture, etc. There are several exceptions in practice, the most frequent being a URL linking to a resource that no longer exists or has migrated. Because the Web server handles both the resource represented by the URL and the URL itself, it is up to the web server's owner ... Read More

How do I convert a string into an integer in JavaScript?

George John
Updated on 07-Jan-2020 11:02:57
The parseInt() method in JavaScript converts a string into a number. The method returns NaN if the value entered cannot be converted to a number.ExampleYou can try to run the following code to convert a string into an integer − Live Demo           Check                      function display() {             var val1 = parseInt("50") + "";             var val2 = parseInt("52.40") + "";             var val3 = parseInt(" 75 ") + "";             var res = val1 + val2 + val3;             document.getElementById("demo").innerHTML = res;          }          

How to validate a given number in JavaScript?

Shubham Vora
Updated on 15-Nov-2022 09:02:03
In this tutorial, let us discuss how to validate a given number in JavaScript. Users can follow the syntax below each method to use it. Using regular expression The method tests or matches the regular expression with the input. Syntax /\D/.test(input); input.match(/^[0-9]*$/); If the input is a number, the test returns true. Example The program succeeds in all cases except for "30", [], and "". Number validation using regular expression Validate ... Read More

How to add a number of months to a date using JavaScript?

Paul Richard
Updated on 07-Jan-2020 11:00:57
To add a number of months to a date, first get the month using getMonth() method and add a number of months.ExampleYou can try to run the following code to add a number of monthsLive Demo                    var d, e;          d = new Date();          document.write(d);          e = d.getMonth()+1;          document.write("Incremented month = "+e);          

Function Expression vs Function Declaration in JavaScript?

Rishi Raj
Updated on 12-Jun-2020 11:30:56
Function DeclarationThe “function” keyword declares a function in JavaScript. To define a function in JavaScript use the “function” keyword, followed by a unique function name, a list of parameters (that might be empty), and a statement block surrounded by curly braces.Here’s an example −function sayHello(name, age) {    document.write (name + " is " + age + " years old."); }Function ExpressionFunction Expression should not start with the keyword “function”. Functions defined can be named or anonymous.Here are the examples −//anonymous function expression var a = function() {    return 5; }Or//named function expression var a = function bar() {    return 5; }