Variables are the core of many programming languages, they allow you to store things and reuse them as many times as you want throughout your code. But what are variables exactly? Let’s find out!
Variables are references to a memory slot where the “thing” you want to store is physically placed. You can access a variable and its stored value by its name, which is defined by the developer.
So, variables contain stuff you can use while programming. But what is this stuff exactly? Depending on the programming language you are using, the values stored by a variable may differ. But first, we need to talk about data types and data structures.
A data structure is a more “complex” construction used to organize data and make its use simpler. There are tons of different data structures, too, and they are used to accomplish different goals. Some of them are usually natively supported by programming languages.
Even though there is a difference between data types and data structures, developers usually refer to both as “types”.
null) plus a bunch of data structures (
If you are used to other programming languages, you may have noticed a few differences:
numberdata type. Plus, note that
bigintis a new entry in the family and it’s not yet supported by all browsers
Most programming languages also allow the definition of custom types, usually through class definitions, enumerations¹, and other constructs. I will not be focusing on custom types in this post, just know that the ECMAScript 6 specification introduced the
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