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Strings are representation of textual data in JavaScript and are fundamental to the language. Programs designed for user interaction almost always make use of strings as a key component.

It’s common to need to access or make calculations with dates and times in JavaScript programs. To handle these situations, there are several date tools built into the language.

Numbers in JavaScript include both integers and floating point numbers as just a single Number type. This is unlike some other programming languages like C# which distinguish between the many types of numbers depending on the size of the number and space taken up in memory.

Objects in JavaScript in their most basic definition are used to store data in key, value entries. Objects are a core building block of many programs in JavaScript and are used for things like storing complex data, building classes, and as an integral part of object-oriented program.

Arrays at their most basic level are collections (or lists) of data. Since programs are constantly working with data, arrays are used extensively in JavaScript. A typical program will add data to list, like products in a shopping cart, which can be stored in an array.