JavaScript Data Types

A data type is a classification of values that determine how a value can be used and manipulated. JavaScript has several built-in data types, including:

• Number: represents numeric values, including integers and floating-point numbers.
• String: represents a sequence of characters, such as a word or phrase. Strings are written using single or double quotes.
• Boolean: represents a logical value, either true or false.
• Null: represents the absence of a value or a null value.
• Undefined: represents the absence of a value or a value that has not been defined.
• Object: represents a collection of key-value pairs, or a complex data structure.

Here are some examples of values of different data types in JavaScript:

var myNumber = 5;        // a number
var myString = "hello";  // a string
var myBoolean = true;    // a boolean
var myNull = null;       // null
var myUndefined;         // undefined
var myObject = {};       // an object

In addition to these built-in data types, JavaScript also supports arrays, which are special objects that can hold a collection of values. Arrays are written using square brackets and can contain values of any data type.

var myArray = [1, 2, 3, "four", true];  // an array

It’s important to note that in JavaScript, all values have a data type, even if it is not explicitly declared. The type of a value is determined automatically by the JavaScript runtime based on the value itself.

You can find the complete JavaScript Tutorials here.

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