Data type means the type of data that can be represented and manipulated in a programming language. Let’s see how dart represents data types.
Dart supports three types of data type. They are represented in a very simple and concise manner. (Let’s keep List and Maps aside for collection part.)
- Numbers
- Strings
- Boolean
- NOTE:- Although Dart is strongly typed, type annotations are optional because Dart can infer types.
When you want to explicitly say that no type is expected, use the special type dynamic.
Numbers
Note: Number representation in dart may vary from platform to platform. That means if you deploy your code on DartVM then the size will be different and if you deploy your code on browser then the size will different. For example, take a look at *int**.
- Numbers in dart are used to represent numeric literals.
Numbers can be divided into two parts.
- Integer
- Double
Integer
An integer used to represent 64-bit non-frictional values (numeric values without a decimal point). Integer literals are represented using int keyword.
- Ex: — 10, 20, 30, 400, 50 etc
Size of int
- On DartVM — [-2⁶³ to 2⁶³-1]
- On browser — [-2⁵³ to 2⁵³-1] (Where number system must be compatible with JavaScript)
Double
Double used to represent fractional values (numeric values with a decimal point). Double literals are represented using double keyword.
Double data type in dart represents a 64-bit (double precision) floating-point number.
- Ex: — 10.20, 20.40, 30.50 etc.
As of Dart 2.1, integer literals are automatically converted to doubles when necessary. Before Dart 2.1, it was an error to use an integer literal in a double context.
Strings
The string represents a sequence of characters. For example, if you want to store some data like name, address, country name, etc. Then you can use a string data type.
By default, string uses UTF-16 code units but you can use UTF-32 code units as well by using runes.
The keyword String used to represent string literals.
You can use single or double quotes for embed string. We’ll discover more about strings in a dedicated post.
Boolean
The Boolean type represents a boolean (flag) values.
bool keyword used to represent boolean values.
Boolean values are true and false. They must be written in lower-case. You cannot use 0 or 1 to represent true or false.
That’s all you need to know about data-types in the dart. Feel free to let me know if I missed something. I’ll Love to learn that.
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