minor fix for typo, indent, link, and sample code, etc #4905
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LiYing2010
commented
Jun 19, 2025
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| **Stabilized `@SubclassOptInRequired`** | ||
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| * KEEP proposal: [subclass-opt-in-required.md](https://github.com/Kotlin/KEEP/blob/master/proposals/subclass-opt-in-required.md) | ||
| * YouTrack issue: [KT-54617](https://youtrack.jetbrains.com/issue/KT-54617) | ||
| * Available since: 2.1.0 | ||
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| </td> | ||
| </tr> | ||
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| <tr filter="stable"> | ||
| <td> | ||
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| **Stable** | ||
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| </td> | ||
| <td> | ||
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JFYI
I moved this one from IN PREVIEW BLOCK to STABLE BLOCK
| @@ -45,7 +45,7 @@ Consider this example that extends the `StringBuilder` class: | |||
| ```kotlin | |||
| fun main() { | |||
| // Lambda expression with receiver definition | |||
| fun StringBuilder.appendText() { append("Hello!") } | |||
| val appendText: StringBuilder.() -> Unit = { append("Hello!") } | |||
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JFYI
I think the lambda expression with receiver should be like this
the original sample code is NOT a lambda expression with receiver, but a local extension function.
also, the following paragraph explains:
The lambda expression assigned to
appendText.....
so I think it should be val appendText = .... here
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| * The `Cat` class inherits from the `Mammal` sealed class and uses the `catName` parameter in its own constructor as | ||
| the `name` parameter from the `Mammal` class. | ||
| * The `Human` class inherits from the `Mammal` sealed class and uses the `humanName` parameter in its own constructor as | ||
| the `name` parameter from the `Mammal` class. It also has the `job` parameter in its constructor. |
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JFYI
I think it should be:
the child classes use the param in in its own constructor, as the parameter from parent class
fix me if I am wrong.
| @@ -204,7 +204,7 @@ In these functions: | |||
| * The `operator` keyword marks these functions as operator functions, enabling them to overload the `get()` and `set()` functions. | |||
| * The `thisRef` parameter refers to the object **containing** the delegated property. By default, the type is set to `Any?`, but you may need to declare a more specific type. | |||
| * The `property` parameter refers to the property whose value is accessed or changed. You can use this parameter to access information | |||
| like the property's name or type. By default, the type is set to `Any?`. You don't need to worry about changing this in your code. | |||
| like the property's name or type. By default, the type is set to `KProperty<*>`. You don't need to worry about changing this in your code. | |||
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JFYI
property in delegate, should be KProperty<*>
| @@ -126,7 +126,7 @@ fun main() { | |||
| {kotlin-runnable="true" id="kotlin-tour-scope-function-let-non-null"} | |||
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| The example: | |||
| * Creates a variable called `confirm`. | |||
| * Creates a variable called `address`. | |||
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JFYI
it's address in the sample code
| @@ -288,7 +288,7 @@ The example: | |||
| * Uses the `.map()` extension function on the `medals` variable. | |||
| * Passes a lambda expression to the `.map()` function that refers to `medals` via the `it` keyword and calls the `.uppercase()` extension function on it. | |||
| * Uses the `.filter()` extension function on the `medals` variable. | |||
| * Passes a lambda expression as a predicate to the `.filter()` function that refers to `medals` via the `it` keyword and checks if the length of the list contained in the `medals` variable is longer than 4 items. | |||
| * Passes a lambda expression as a predicate to the `.filter()` function that refers to `medals` via the `it` keyword and checks if the length of the string contained in the `medals` variable is longer than 4 characters. | |||
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JFYI
it's string, instead of list
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