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docs(optional-sum): correct grammar

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davhojt 2023-01-19 11:16:59 +00:00 committed by Dav Hojt
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commit 0fd1aeb314
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subjects/mobile-dev/optional-sum/README.md
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@ -1,32 +1,30 @@
# Optional Sum
## Optional Sum
### Instructions
Write a function called `optionalSum()` that accepts two integer arguments, and an optional integer argument. Return the sum of all the arguments.
Write a function named `optionalSum` that accepts two `int` arguments, and an optional `int` argument. Return the sum of all the arguments.
### Optional parameters
In Dart you can also make function arguments optional, meaning that a function can work even if the optional argument is omitted. If the optional parameter is omitted, it is considered to be null.
In Dart, you can make function arguments optional, meaning that a function can work even if the optional argument is omitted. If the optional parameter is omitted, it is considered to be `null`.
### Usage
Example of function with optional parameters:
A function with optional parameters:
```dart
void someFunction(int firstParameter, int secondParameter, [int? optionalParameter]) {
if (optionalParameter != null) {
print('${firstParameter}, ${secondParameter}, ${optionalParameter}');
void someFunction(int first, int second, [int? third]) {
if (third != null) {
print('${first}, ${second}, ${third}');
} else {
print('${firstParameter}, ${secondParameter}');
print('${first}, ${second}');
}
}
void main() {
void main() {
someFunction(1, 2);
someFunction(1, 2, 3);
}
```
- Note: Optional parameters must come after the required parameters.
> Optional parameters must come after the required parameters.
- Note: You cannot use both optional and named parameters, you should choose only one of them.
> You cannot use both optional and named parameters.