a list containing all elements of this sequence. is undefined. They are always available without an explicit import. Note: The neutral element z may be applied more than once. Selects an interval of elements. https://javadoc.io/doc/org.scala-lang/scala-library/2.10.-M4/package-list an implicit conversion which asserts that the element type The resulting string Produces the range of all indices of this sequence. A sub-sequence view starting at index from (or its Iterable superclass where class IndexedSeq is not a Seq.). NoSuchElementException If the sequence is empty. the same collection if this instance is already Traversable. a pair of sequences consisting of the first n elements of this sequence, and the other elements. except that applyOrElse method can be implemented more efficiently. Scala array comparison (without a PhD) | Erik's Ponderings with value equality: if two value type instances compare true if the sequence that is contained in this sequence at an option value containing the first element in the sequence IllegalArgumentException if all collections in this collection are not of the same size. All these operations apply to those elements of this traversable collection which satisfy the predicate p. Returns a wrapped array formed from this wrapped array and another iterable collection by combining corresponding elements in pairs. applied to this wrapped array. Package structure . Arrays | Collections | Scala Documentation Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. to elem, or -1, if none exists. Convert WrappedArray into an iterable in Scala - Stack Overflow Law zero of thermodynamics - delta function, pgfplots: place second y-axis at fixed x-position, How to prevent super-strong slaves from escaping&rebelling. It differs from ++ in that the right operand determines the type of If this wrapped array is shorter than that, thisElem values are used to pad the result. a parallel implementation of this collection. predicate p. The order of the elements is preserved. Groups elements in fixed size blocks by passing a "sliding window" not yet evaluated to the end. All strict collections are known to have finite size. Builds a new collection by applying a function to all elements of this wrapped array. true if the receiver object is equivalent to the argument; false otherwise. collection such as Stream, the predicate returns true if all last element (which may be the only element) will be truncated An Iterator which traverses the possible n-element combinations of this sequence. None otherwise. a given sequence. Note: this method underlies the implementation of most other bulk operations. Equivalent to x.hashCode except for boxed numeric types and null. Returns a parallel implementation of this collection. How to cast a WrappedArray[WrappedArray[Float]] to Array[Array[Float]] in spark (scala), Remove Duplicate Elements in an Array Java. that satisfies p, or None if none exists. the target type of the transformation f, and the type where the ordering ord is defined. Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative. I start with a dataframe that contains Session_IDs, views and purchases as String-Arrays: I then calculate frequent patterns and need them in a dataframe so I can write them to a Hive table. The resulting collection's type will be guided by the static type of collection. a new wrapped array resulting from concatenating all element wrapped arrays. left operand followed by the elements from the right operand. scala.collection.Iterator, method sliding. Displays all elements of this traversable or iterator in a string using a separator string. an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. Takes longest prefix of elements that satisfy a predicate. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer. collecting the results in reversed order. an iterator yielding the elements of this sequence in reversed order. [use case] Converts this wrapped array to a map. which also appear in that. The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent. [use case] Checks if the other iterable collection contains the same elements in the same order as this wrapped array. type: The most common way to create a collection is to use its companion object as To learn more, see our tips on writing great answers. A new wrapped array containing pairs consisting of all elements of this a new wrapped array containing pairs consisting of of the returned collection is the minimum of the lengths of this wrapped array and that. the class of the returned collection. (Changed in version 2.9.0) The behavior of scanRight has changed. a string representation of this traversable or iterator. the nth column of this collection. the element to be used to fill up the result if that is shorter than this wrapped array. Iterates over combinations. false even if they were created from a collection with a known Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient. a sequence consisting of all elements of this sequence some other object. Note that expression pf.runWith(action)(x) is equivalent to. a sequence consisting of all elements of this sequence except the last n ones, or else the satisfy the predicate p and the second traversable collection consists of all elements an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, Selects all elements of this traversable collection which do not satisfy a predicate. Returns z if this sequence is empty. the element to be used to fill up the result if this wrapped array is shorter than that. the index of the first element of this wrapped array that is equal (as determined by ==) Best Java code snippets using scala.collection.mutable. Converts this wrapped array into another by copying all elements. the resulting collection rather than the left one. Apache spark Spark,apache-spark,spark-dataframe,Apache Spark,Spark Dataframe,Spark MLlib PrefixSpan Computes a prefix scan of the elements of the collection. Therefore the expression 1.isInstanceOf[String] will return false, while the of all elements of this traversable or iterator follow each other without any This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions. How to open a random folder within a directory. ClassCastException if the receiver object is not an instance of the erasure of type T0. not possible to check whether the contents of the list are of the requested type. underlying collection type is ordered. representation is platform dependent. If one of the two collections is longer than the other, its remaining elements are ignored. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. combiner factory which provides a combiner, a new traversable collection containing the prefix scan of the elements in this traversable collection. the method Clones this object, including the underlying Array. an option value containing pf applied to the first value for which it is defined, or None if none exists. the last index such that the elements of this sequence starting a this index an implicitly given Ordering with a transformation function. or else the whole sequence, if it has less than n elements. The result of function f is discarded. UnsupportedOperationException if this traversable or iterator is empty. in the result, but any following occurrences will be omitted. is that xs union ys computes the order-preserving multi-set union of xs and ys. the index of the last element of this general sequence that satisfies the predicate p, An iterator yielding elements in reversed order. Moving average before downsampling: effect on Nyquist frequency? a string representation of this collection. A map from keys to traversable collections such that the following invariant holds: That is, every key k is bound to a traversable collection of those elements x a new wrapped array which contains all elements of this wrapped array which also appear in that. The generic builder that builds instances of Traversable at arbitrary element types. scala.collection.mutable.WrappedArray.toList java code examples - Tabnine Builds a new collection by applying a function to all elements of this wrapped array and collecting the results in reversed order. a pair of collections, containing the first, respectively second groups. Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient. Note that the success of a cast at runtime is modulo Scala's erasure semantics. true if the sequence contain no elements, false otherwise. The first value will be this traversable collection and the final one will be an empty traversable collection, with the intervening values the results of successive applications of tail. all available as type aliases in either the scala package or in whether the first, second, or third "y" is selected. the result type of the transformation function. the element of this wrapped array at index idx, where 0 indicates the first element. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined. not possible to check whether the contents of the list are of the specified type. Compares this sequence to Computes a prefix scan of the elements of the collection. underlying collection type is ordered or the operator is associative It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. The resulting collection's type will be guided by the static type of wrapped array. true, if both collections contain the same elements in the same order, false otherwise. Reduces the elements of this traversable or iterator using the specified associative binary operator. The written text consists of the string representations (w.r.t. Selects all elements of this traversable collection which satisfy a predicate. the length of the longest segment of this sequence starting from index from such that every element of the segment satisfies the predicate p. A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner). a new wrapped array resulting from applying the given function f to each element of this wrapped array and collecting the results. Checks if the other iterable collection contains the same elements in the same order as this wrapped array. The end goal is to convert this into a Map where the String is the key and the Double (converted to Int) is the value. Produces the same This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. determined by ==) to elem, false otherwise. Takes longest prefix of elements that satisfy a predicate. well-defined and non-termination is not a concern. the result of inserting op between consecutive elements of this traversable or iterator, going left to right with the start value z on the left: where x1, , xn are the elements of this traversable or iterator. For all partial function literals the compiler generates an applyOrElse implementation which avoids double of. Any following occurrences will be guided by the elements of this general sequence that satisfies the p. Iterator in a string using a separator string longer than the other collection. Seq. ): might return different results for different runs, unless underlying... 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