JavaScript Variables and Values

Basic

A JavaScript variable gives a value a name so your program can refer to that value later. Modern JavaScript commonly uses let for values that may be reassigned and const for bindings that should not be reassigned.

const language = "JavaScript";
let learners = 1;
learners += 1;

console.log(language);
console.log(learners);

Edit and run the example

The HTML file provides the document, the CSS file provides its presentation, and the JavaScript file changes the document and writes to the example console. Try changing the values, then run the example.

What to notice

• The variable name lets the program refer to a value without repeating the value itself.

• The let binding can be reassigned.

• The JavaScript file can read and change elements in the HTML document.