Most Important JavaScript programms || JS Programms

 Most Important JavaScript programms

 

          Get the length of an array:

        var length = array.length;

       

        Convert an array to a string:

        var string = array.join(',');

       

        Check if a variable is null or undefined:

        if (variable == null) {

          // variable is null or undefined

        }

       

        Remove an element from an array by its index:

        array.splice(index, 1);

       

        Convert a number to a string:

        var string = number.toString();

       

        Get the current URL of the page:

        var currentURL = window.location.href;

       

        Round a number to a specified decimal place:

        var roundedNumber = number.toFixed(decimalPlaces);

       

        Get the index of the first occurrence of an element in an array:

        var index = array.indexOf(element);

       

        Create a new object with specific properties from an existing object:

        var newObject = {

          property1: existingObject.property1,

          property2: existingObject.property2

        };