James Strachan
18 lines
713 B
Kotlin
18 lines
713 B
Kotlin
package std.util
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import java.util.*
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/** Returns a new collection containing the results of applying the given function to each element in this collection */
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inline fun <T, R> java.util.Collection<T>.map(result: Collection<R> = ArrayList<R>(this.size), transform : (T) -> R) : Collection<R> {
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for (item in this)
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result.add(transform(item))
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return result
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}
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/** Returns true if the collection is not empty */
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inline fun <T> java.util.Collection<T>.notEmpty() : Boolean = !this.isEmpty()
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/** Converts the nullable collection into an empty collection if its null */
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inline fun <T> java.util.Collection<T>?.notNull() : Collection<T>
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= if (this != null) this else Collections.EMPTY_LIST as Collection<T>
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