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Articles by Shubham Vora
Page 79 of 80
How can we use a JavaScript function as an object?
This tutorial will teach us to use the JavaScript functions as an object. However, functions, objects, and arrays are the mutable data types in JavaScript, and all mutable data types are the objects.The JavaScript object is one type of entity that contains the key-value pairs. It contains unique keys; every key has some values that can be of any type. We can use the object key to access the values of the objects.We can create a function so that it behaves like an object. Below, we have given a detailed explanation of converting the function to an object.Use JavaScript function ...
Read MoreHow can we assign a function to a variable in JavaScript?
In this tutorial, we will learn to assign a function to a variable in JavaScript. The function is the code block that we can reuse quickly, often just by making a function call. There are two ways to declare a function in JavaScript, one is a named function, and another is an anonymous function.Most JavaScript programmers are familiar with the name function, and users can follow the below syntax to declare the named function.function function_name() { //function body }In the above syntax, users can see that, we can create a function definition with the function keyword and following by function ...
Read MoreHow can I simplify the usage of Regular Expressions with JavaScript?
In this tutorial, we will learn to simplify the use of regular expressions in JavaScript. Some of you have heard the regular expression word for the first time. So, it is not related to JavaScript but can be used in any programming language.The simple definition of the regular expression is that it is a sequence of the characters, also called Regex or RegExp. It can be a small or complex sequence.Let’s understand the need for regular expression by the example in the below section.Why should we use regular expressions?Suppose that you are developing the application and you need to take ...
Read MoreHow can I show image rollover with a mouse event in JavaScript?
This tutorial will teach us to show image rollover with a mouse event in JavaScript. The meaning of the image rollover is to either change the image style or the whole image when the user rollovers the mouse on the image.To build an attractive user interface, developers often add image rollover features to the website and applications. Here, we will see to apply image rollover differently.Change the style of the image on mouse rolloverIn this method, to create the image rollover, we will use the onmouseover and onmouseout event of JavaScript. When users take the mouse pointer on the image, ...
Read MoreHow can I round down a number in JavaScript?
This tutorial teaches us to round down a number in JavaScript. The meaning of the round-down number is “returning the integer which is equal to or less than the current float number”.For example, if we round down the number 9.99, we get 9 as an output, and in the same way, for 8.01 we get 8 as an output. In simple terms, if you represent your current number in the number line, you must return the nearest integer that resides on the left side of the current number.In this tutorial, we will take a look at three different approaches to ...
Read MoreHow can I replace newlines with spaces in JavaScript?
This tutorial teaches us to replace newlines with spaces in JavaScript. Often, programmers find unusual line breaks in the string, and the random line breaks look weird when we render them on the webpage using JavaScript.So, the solution is that programmers just need to remove the line breaks and join the string with the space or other characters. Here, we have different approaches to solving this problem, and we will use the regular expression with the replace() method to remove the unusual line breaks.Using the replace() MethodUsing the split() and join() MethodsUsing the replace() MethodIn this approach, we will use ...
Read MoreHow can I get a JavaScript stack trace when I throw an exception?
This tutorial teaches us to get a JavaScript stack trace when we throw an exception. Usually, the developer uses the stack trace to identify the errors while executing the program's code. However, we use the stack trace to debug the program.Using the stack trace, we can get knowledge of any kind of exceptions, such as constructor error, naming error, etc., in our program, and we can correct them.Before we approach analyzing the error using the stack trace, we should know how to stack trace works.How does the call stack trace works?The stack is the primary data structure that follows the ...
Read MoreHow can I declare optional function parameters in JavaScript?
This tutorial will teach us how to declare optional function parameters in JavaScript. While declaring the function, we pass some variables to the function definition to use it inside the function block, called function parameters. The function parameters can also be optional, which gives us the independence to pass function arguments when we call the function. Here, Arguments are the values we pass while calling the function, and parameters are the variables we pass in the function definition.Optional ParametersThe optional parameter word means that you don’t need to pass that parameter every time you call the function, giving you the ...
Read MoreHow can I check whether a variable is defined in JavaScript?
In this tutorial, we will learn to check the existence of the variable, which means whether the variable is declared and initialized or not in JavaScript. In many scenarios, JavaScript programmers need to check the presence of the variable. Otherwise, it throws a reference error if we use it without declaring or defining it.For example, Programmers have defined the variable and it is uninitialized. Programmers want to change the variables' value through the data they will get from API calls. Suppose that the value of the uninitialized variable is not updated due to some error during the API call. If ...
Read MoreHow can I convert the arguments object to an array in JavaScript?
This tutorial teaches us to convert the arguments object to array in JavaScript. Before we proceed with the tutorial, let’s look at the arguments object. In JavaScript, every function contains the ‘arguments’ object. It includes the values of all arguments we passed while calling or invoking the function.It is very similar to an array, but it is not an actual array.The ‘arguments’ object has a length property, and we can use it to know how many arguments are passed during the function call.We can access all values of the ‘arguments’ object like an array index property. For example, arguments[0] give ...
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