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Javascript Articles
Page 185 of 534
How do I replace a character at a particular index in JavaScript?
It is often required to update the string and replace the single character at a particular index while programming with JavaScript. JavaScript doesn’t contain the built-in method to replace the single character at the particular index in the string as the Java and C++, but we can use some other built-in methods and create custom logic to solve our problem.In this tutorial, we have two methods to replace the character at a particular index in the string and update the string. One is by converting string to array, and another is using the substr() built-in method of JavaScript.Replace Character by ...
Read MoreHow do I empty an array in JavaScript?
This tutorial teaches us to make an array empty in JavaScript. While programming with JavaScript, programmers need to make an array empty in many conditions. For example, coders are doing competitive programming with JavaScript. Suppose, to solve some problem, they need to create a new or an empty array while calling the function every time. Users can visualize this problem from the below example.function child ( ){ // create a new array or use a single array and make it empty every time function invokes } function parent ( ) { for ( int ...
Read MoreHow do I convert a float number to a whole number in JavaScript?
In this tutorial, we will learn to convert a float number to a whole number in JavaScript. The whole number is the number that doesn’t contain the fractional part. For example, 5.22 is the float number containing the fractional part, and the whole number doesn’t contain a decimal part. So, our goal in this tutorial is to remove the fractional part from the number.We can have various methods to cut out the decimal part from the float number to make it whole, and some of them we have discussed here.Using the Math.trunc() and Math.round() MethodsUsing the parseInt() MethodUsing the Bitwise ...
Read MoreHow do I compare String and Boolean in JavaScript?
In this tutorial, we will learn to compare a string to the Boolean in JavaScript. The JavaScript has an equality operator to compare one value with another value.There are two types of equality operators in JavaScript; one is an equality operator (==), and another is a strict equality operator (===). The difference between both of them is they compare operands differently.The equality operator compares the only values of both operands and returns the Boolean value.The strict equality operators first compare the values of both operands, and if the values match, it compares the data type of both operands. In such ...
Read MoreHow can I escape HTML special chars in JavaScript?
HTML contains special characters such as ‘, ’ ‘/, ’ and many more such as single and double commas. These special characters are used for the HTML tag, such as ‘’ is used to close the HTML tag. This tutorial teaches us to escape HTML special characters in JavaScript.Now, the question is that what if we want to use these characters inside the HTML content? If we use special characters normally in the HTML content, it considers it the opening or closing HTML tag and produces an unknown error.For example, we need to render the below string to the browser. ...
Read MoreHow 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 ...
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