part 12 var data type dart programming tutorials in hindi urdu

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dart programming tutorial: part 12 - `var` data type

introduction
dart programming language is a versatile and modern language used for building web, server, and mobile applications. in this tutorial, we will discuss the `var` data type, which is used for declaring variables in dart. we'll cover its usage, benefits, and provide code examples.

`var` data type
in dart, `var` is a keyword used to declare a variable whose type is inferred by the dart compiler. this means that you do not need to specify the type explicitly; dart will determine the type based on the assigned value.

benefits of using `var`
1. **type inference**: the compiler automatically determines the type, making the code cleaner and more readable.
2. **flexibility**: you can still change the value of the variable to a different type, but it is generally not recommended as it can lead to confusion.

syntax
example
let's take a look at a simple example to understand how `var` works in dart.
explanation of the code
1. we declare three variables using `var`: `name`, `age`, and `height`.
- `name` is inferred as a `string`.
- `age` is inferred as an `int`.
- `height` is inferred as a `double`.
2. we print the values of these variables using the `print()` function.
3. we then update the value of the `name` variable to "sara".
4. if we try to assign an integer to the `name` variable (which was inferred as a `string`), it will cause a compile-time error.

conclusion
in this tutorial, we learned about the `var` data type in dart, its benefits, and how to use it effectively. the `var` keyword allows for cleaner and more readable code by enabling type inference. however, it is important to be cautious about changing variable types after they have been declared to avoid errors.

further learning
- explore other data types in dart such as `int`, `double`, `string`, `bool`, and how they differ from `var`.
- understand the concept of type safety in dart.

feel free to practice with more examp ...

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