71 lines
1.1 KiB
Markdown
Vendored
71 lines
1.1 KiB
Markdown
Vendored
# all
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<web-summary>
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Discover `all` operation in Kotlin Dataframe.
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</web-summary>
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<card-summary>
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Discover `all` operation in Kotlin Dataframe.
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</card-summary>
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<link-summary>
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Discover `all` operation in Kotlin Dataframe.
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</link-summary>
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<!---IMPORT org.jetbrains.kotlinx.dataframe.samples.api.utils.AllSamples-->
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Checks if all rows in the [](DataFrame.md) satisfy the predicate.
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Returns `Boolean` — `true` if every row satisfies the predicate, `false` otherwise.
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```kotlin
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all { rowCondition }
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rowCondition: (DataRow) -> Boolean
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```
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**Related operations**: [](any.md), [](filter.md), [](single.md), [](count.md).
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### Examples
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<!---FUN notebook_test_all_3-->
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```kotlin
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df
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```
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<!---END-->
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<inline-frame src="./resources/notebook_test_all_3.html" width="100%" height="500px"></inline-frame>
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Check if all persons' `age` is greater than 21:
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<!---FUN notebook_test_all_4-->
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```kotlin
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df.all { age > 21 }
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```
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<!---END-->
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Output:
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```text
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false
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```
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Check if all persons have `age` greater or equal to 15:
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<!---FUN notebook_test_all_5-->
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```kotlin
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df.all { name.first().isUpperCase() && age >= 15 }
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```
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<!---END-->
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Output:
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```text
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true
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```
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