![]() js extension, then use the src property in the script tag.ġ1. Write JavaScript code in an external file with a.Use the tag to add JavaScript code to an HTML document.How Can You Embed Javascript Code in an HTML File? Properties can be of various data types and are related to JavaScript DOM objects, much like an instance variable for DOM elements.Īttributes are part of the HTML, and unlike a property, is a String data type. What Is the Difference Between Attributes and Property? Rich interfaces: Items like drag-and-drop components and sliders enhance the UXĩ.Low server interaction: Allows user input validation before sending data to the server, reducing server traffic and load.Immediate feedback: Visitors need not wait for a page reload to see if they’ve forgotten to enter important details.Enhanced interactivity: Allows creation of interfaces that react to user input.Describe the Most Important Advantages of Using JavaScript. Note this is one of those JavaScript coding interview questions that’s good to know. Import * as objectName from'./file-path.js' You can use the import keyword and the asterisk (*) symbol. How Can You Import All Named Exports From a JavaScript File? Undefined: When a variable is declared and not yet assigned a valueħ.Symbol: Used for creating unique identifiers for objects.Null: Represents empty, nothing, and unknown type of values.Boolean: Represents true & false values.BigInt: Represents very large numbers with precision.Number: Represents numbers (integer & floating-point values).String: Represents text, denoted by single quotes, double quotes, or backticks.Summarize the Primitive JavaScript Data Types. This means the variable exists, but its value is yet to be defined. If you try to read an undeclared variable, JavaScript throws an error.Īn undefined variable has been declared in the program, but no value has been assigned. What’s The Difference Between Undeclared & Undefined Variables?Īn undeclared variable has not been declared anywhere in the code, so said variable does not exist. Note this is one of the most basic JavaScript programming questions, so ensure you know it. How Do You Add Comments to JavaScript Code?įor a single line of comment, you use two forward slash symbols (//) // Add a single line of commentįor multi-line comments, wrap them with slashes and asterisks (/* */) /* In terms of apps, Java is used to create apps on devices or browsers, and JavaScript is mainly used with HTML documents and browsers. This means that JavaScript is written in text and then interpreted, and Java is compiled. While Java is an OOP language, JavaScript is an OOP script. ![]() ![]() While they share some letters in their names, they are not interlinked and are designed for different purposes. ![]()
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