import

Learn to import packages with import.

The import statement

The import statement brings another library into your code. Core libraries are written import 'dart:math';, packages import 'package:http/http.dart';.

With show you take only some names, with hide you hide some names. With as you give a prefix: import 'dart:math' as m;.

Imported names become available in the file scope. Two same-named symbols are separated with as.

show, hide and as

With show you take only specific names from a library: import 'dart:math' show max;. With hide you hide some names.

With as you give a prefix: import 'dart:math' as m;. Then you write m.max(3, 7). This prevents name clashes.

These combinators keep code tidy; they stop unneeded names from entering scope.

Exercise max and min

Import the library with import 'dart:math';. In main print the results of max(5, 9) and min(5, 9) on a single line, separated by a space, with print.

Show example solution

import 'dart:math';

void main() {
  print('${max(5, 9)} ${min(5, 9)}');
}

Test yourself

What kind of import is package:http/http.dart?
- Core library
- Relative file
- System library
- Package import
Show answer

Package import — the package: prefix marks a package import.
Importing dart:math
```
import '____';
```
Show answer
```
import 'dart:math';
```
Import forms

import 'dart:math';

Core library
import 'package:http/http.dart';

Package
show

Name selection
as

Prefix

Next lesson: pub publish

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