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Javascript Articles
Page 268 of 534
How is NaN converted to Boolean in JavaScript?
In this article, we will learn how to convert NaN to Boolean. NaN in JavaScript means Not a Number, whose type is a Number but actually, it is not a number. To Convert, the NaN to a Boolean we use Multiple methods some of which are discussed below. Using the Boolean() Function Using the !! Operator Using the NOT Operator and isNaN() Method Using the Boolean() Function The Boolean function is used to get the Boolean value (True or False) of any variable, condition, or object. To convert the NaN into Boolean we just need to pass the ...
Read MoreHow null is converted to Number in JavaScript?
In JavaScript null is a predefined keyword that represents an empty value or unknown value of no value. The data type of null is an object. In this article, we will learn how to convert null into Boolean using multiple approaches which are following. Using Number() Method Using Logical OR (||) Using the ~~ operator Using Ternary Operator Concatenating null with a boolean value Using the Number() Method The Number() method in JavaScript is used to convert a value into a number. If the value is not convertible, then it will return NaN. To convert the null into ...
Read MoreHow null is converted to Boolean in JavaScript?
In JavaScript null is a predefined keyword that represents an empty value or unknown value of no value. The data type of null is an object. In this article, we will learn how to convert null into Boolean using multiple approaches which are following. Using the Boolean function Using the !! operator Using the Boolean function The Boolean function is used to get the Boolean value (true or false) of any variable, condition, or object. To convert the null into Boolean we just need to pass the null in the Boolean function. Syntax Boolean(null) Example 1 In this example, ...
Read MoreHow is JavaScript an untyped language?
JavaScript is an untyped language because in JavaScript the variables can hold any data type meaning that JavaScript does not have a type declaration and when the variable is created we do not need to specify any data type unlike other programming languages like Java, C#, C++, etc. which needs int, char, float, etc. to create a variable. In JavaScript we use var, let, and const to create a variable. One of the best parts of untyped language is it gives the flexibility to reassign any type of value to a variable, it doesn't matter whether the initialized value was ...
Read MoreHow can I remove the (//<![CDATA[ , //]]>) blocks; tags inside a script element in Javascript?
CDATA, the short form of Character Data is a block of code that has been written to prevent parsing by the parser. Sometimes our data includes predefined characters like “ Syntax str.replace("regex", "") Here str is the string from which you want to remove the CDATA, regex is the regular expression to find the block data. Example In the below program example, we remove the CDATA blocks and tags inside a script element using the String replace() method. We pass the regex defined above as an argument to the replace() method and the second argument is an empty string. ...
Read MoreHow can I remove all child elements of a DOM node in JavaScript?
Suppose you are building a web app that manages the data of daily tasks, the user inserts the task and a list of tasks gets formed. But at some point in time, the user wants to remove all the tasks from the list and wants to make the list empty. So, as a developer, you should know how to remove all the child elements from the DOM node. To remove all the elements from the DOM node we have the following approaches. By iterating the DOM nodes and using the removeChild method. By Erasing the innerHTML value to a ...
Read MoreHow to convert Number to String in JavaScript?
This tutorial will teach us to convert the number to string in JavaScript. Changing the type of variable is called the type conversion of a variable. While coding, the programmer needs to deal with the different data types and might need to convert the variable's data type. Every programming language has different methods to convert one variable from one data type to another data type, and JavaScript also has some methods, which are explained below. Using the toString() Method Concatenating with an empty String Using the string() Constructor Using the toString() Method In JavaScript, the toString() method is ...
Read MoreHow to convert Number to Boolean in JavaScript?
This tutorial will teach us to convert a number to a Boolean in JavaScript. The variable of Boolean data type can contain only two values, true and false. When we convert the variables of any other data type to Boolean, it returns true for all non-falsy values and false for all falsy values. Let’s understand the falsy values. The JavaScript contains 6+ falsy values, and some of them are as below. Null 0 NaN False Undefined ‘ ’ From the above falsy values, we can say that for 0, we will get the false Boolean value and for ...
Read MoreHow to convert a negative number to a positive one in JavaScript?
This tutorial will teach us to convert negative numbers to positive ones. Sometimes, programmers need to perform some operation with the unsigned value of the number, and in such a case, they need to convert the negative numbers to positive numbers. We will go through the various methods to convert a negative number to a positive number in this tutorial. Using the Math.abs() Method Multiplying the negative number with -1 Using the Bitwise Not Operator Using the Math.abs() Method The Math.abs() method is the JavaScript math library method. The Math.abs() method takes a value as a parameter and ...
Read MoreHow to convert Decimal to Binary in JavaScript?
This tutorial will teach us to convert the decimal number to a binary number string. The binary number is the string of only 0 and 1. The computer doesn’t understand the high-level programming language, so we need to instruct the computer in a low-level language, represented as the binary string. Also, binary string is used in digital electronics. Here, we have three methods to convert the decimal number to a binary string. Using the toString() Method Using the right shift Operation Using the modulo Operator Using the toString() Method The toString() method is JavaScript built-in string method that ...
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