How do JavaScript variables work?

How do JavaScript variables work?

In javascript variables work like this. They’re used to contain values which can be used later in the program for different operations and algorithms. A variable can only contain one value at a time, which can be of any data type. Meaning either a string, number, boolean, array, object, function or null or undefined.

What are the types of variables in JavaScript?


  • Numbers: 5, 6.5, 7 etc.
  • String: “Hello GeeksforGeeks” etc.
  • Boolean: Represent a logical entity and can have two values: true or false.
  • Null: This type has only one value : null.
  • Undefined: A variable that has not been assigned a value is undefined.

How do you call a variable in JavaScript?

After declaring a variable or function with the var keyword, you can call it at any time by invoking its name.

How set JavaScript variable in HTML?

You don’t “use” JavaScript variables in HTML. HTML is not a programming language, it’s a markup language, it just “describes” what the page should look like. If you want to display a variable on the screen, this is done with JavaScript. Then you need to update your JavaScript code to write to that



Can you have variables in HTML?

The HTML element represents the name of a variable in a mathematical expression or a programming context. It’s typically presented using an italicized version of the current typeface, although that behavior is browser-dependent.

Where do we use JavaScript in HTML?

To include an external JavaScript file, we can use the script tag with the attribute src . You’ve already used the src attribute when using images. The value for the src attribute should be the path to your JavaScript file. This script tag should be included between the tags in your HTML document.

What is difference between HTML and JavaScript?

HTML is a standard markup language that provides the primary structure of a website. JavaScript is an advanced programming language used to create dynamic web pages. HTML is rendered from all server-side which is different from client-side scripting.

Should I learn JavaScript or HTML first?

Always learn HTML first. JavaScript can be learnt as a basics of Programming languages. For example, if your main aim is learning Java, you can start with JavaScript as JavaScript is forgiving and gives you less headache with your language syntax.

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