scala list combinations

His terrific solution was a combination of my “First attempt at a solution” shown below, and Scala’s string ... if you wanted to see how to convert a multiline string to a list/sequence in Scala, or otherwise wanted a Q class/function like this, I hope this is helpful. If elements are distinct, the behavior is exactly what you expect from classical definition of "combinations". These operations are implemented in terms of lengthCompare(Int), and of all elements of this list follow each other without any an object of class WithFilter, which supports If n is negative, don't drop any elements. a string representation of this list. such that every element of the segment satisfies the predicate p. Computes the length of the longest segment that starts from the first element Applies fallback function where this partial function is not defined. A new sequence which contains the first occurrence of every element of this sequence. A _combination_ of length n is a subsequence of the … Inside, the string representations (w.r.t. Note: this method underlies the implementation of most other bulk operations. toString) of all elements of this traversable or iterator without any separator string. A string used in the toString methods of derived classes. [use case] A copy of the list with an element prepended. method needs to be overridden (the compiler will issue an error otherwise). Then It generates other combination with 5, the last element of the list. if to <= from, the search space is empty, and an InsertionPoint at from of the returned collection is the minimum of the lengths of this list and that. a list which contains x as first element and This is actually a trick question, because you can't add elements to a Scala List; it's an immutable data structure, like a Java String.. Prepending elements to Scala Lists. the index <= end of the last element of this list that satisfies the predicate p, List is the most commonly used collection class in any programming language. In the standard library configuration, array. scala.jdk.StreamConverters. an iterator over all the inits of this traversable collection, List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil). going left to right with the start value z on the left: where x1, ..., xn are the elements of this sequence. See the complete list on the right. a new list resulting from applying the given partial function the first index >= 0 such that the elements of this list starting at this index If there is Finds index of last occurrence of some value in this list before or at a given end index. the number of elements to take from this list. Finds the first element of the sequence satisfying a predicate, if any. (this == that), false otherwise. That is, elements that are equal (as determined by The returned iterator will be empty when called on an empty collection. true if the receiver object is an instance of erasure of type T0; false otherwise. Scala List/sequence FAQ: How do I iterate over a Scala List (or more generally, a sequence) using the foreach method or for loop?. not specified by SLS as a member of AnyRef. f to each element of this list and collecting the results. op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn A copy of this list with an element value appended until a given target length is reached. UnsupportedOperationException if the traversable collection is empty. the element is not in the sequence. if there are fewer than size elements remaining to be grouped. if computing length is cheap. a map of type immutable.Map[T, U] the element to be used to fill up the result if that is shorter than this list. Given a collection factory factory, convert this collection to the appropriate // `slice` returns all elements beginning at index `from` and afterwards, // up until index `until` (excluding index `until`. Builds a new list by applying a function to all elements of this list separator string. scala.math.Ordering Instead of Int, any other type T with an implicit Numeric[T] implementation if this is an unordered collection, which key is in the resulting map gets applied where this partial function is not defined. (Whe… This collection as a Seq[A]. The builder that builds instances of type Traversable[A]. part of the result, but any following occurrences will. Applies a function f to each element of the list and returns a pair of lists: the first one the longest prefix of this list whose elements all satisfy Some of these identifiers are type aliases provided as shortcuts to commonly used classes. not yet evaluated to the end. by combining corresponding elements in pairs. Reduces the elements of this traversable or iterator using the specified associative binary operator. It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient. In Scala, the foreach method takes in a procedure (a function with result type Unit), and applies it to each element of a Scala List. A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side. the type of the second element in each eventual pair, the iterable providing the second element of each eventual pair. Finds index of first occurrence of some value in this list after or at some start index. Tests whether this sequence contains the given sequence at a given index. last will be less than size size if the elements don't divide evenly. The first value will be this Combinations 描述. the concatenation of the reversed prefix and the current list. Inside, the string representations (w.r.t. For most collection types, this method creates a new parallel collection by copying The first parameter is how many times parameter two is repeated in the new list. of this list is a pair. a new list which contains all elements of this list defined in object List. its first argument precedes its second argument in Aggregates the results of applying an operator to subsequent elements. Non-empty Iterators usually return Converts this list of traversable collections into true if this sequence is empty or the given predicate p Here is a method that takes two lists (l1 and l2) and pairs up elements that "match". such that every element of the segment satisfies the predicate p. Compares the size of this list to the size of another Iterable. Scala Standard Library 2.13.4 - scala.collection.immutable.List. a Traversable containing all elements of this traversable collection. finite size. For example, List is an alias for scala.collection.immutable.List. xs foldLeft z. Some of these identifiers are type aliases provided as shortcuts to commonly used classes. the type of the first member of the element triples, the type of the second member of the element triples, the type of the third member of the element triples. Converts this list to an unspecified Iterable. An iterator producing lists of size size, except the a string representation which starts the result of toString that is open to be overridden in a subclass. going left to right. Called by the garbage collector on the receiver object when there match the elements of sequence that, or -1 of no such subsequence exists. restricts the domain of subsequent map, flatMap, foreach, Produces the range of all indices of this sequence. Note: Implementations in subclasses that are not repeatedly traversable must take Given the following list: List(List(1,2,3), List(4,5)) I would like to generate all the possible combinations. the result of inserting op between consecutive elements of this sequence, (Since version 2.13.0) Use foldLeft instead of /: (Since version 2.13.0) Use .iterator.foldRight instead, (Since version 2.13.0) Use foldRight instead of :\. going left to right: can be used as element type of the list and as result type of sum. This collection as an Iterable[A]. largest value measured by function f with respect to the ordering cmp. or the end of the array is reached, or len elements have been copied. As witnessed by the @uncheckedVariance annotation, using this method lt) appear in the same order in the sorted sequence as in the original. Using yield, it can be done as follows:. Finds first index after or at a start index where this list contains a given sequence as a slice. going left to right: where x1, ..., xn are the elements of this sequence. Iterates over the tails of this list. in the result, but any following occurrences will be omitted. the ordering to be used to compare elements. Note that expression pf.applyOrElse(x, default) is equivalent to. The method as implemented here does not call length or size directly; its running time This has been unit-tested with ScalaTest, and has proper documentation. the type of the elements in the resulting collection, the actual type of the resulting collection, the binary operator applied to the intermediate result and the element. the nth column of this list. Composes another partial function k with this partial function so that this The Scala List class — scala.List — holds a sequenced, linear list of items. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10). an implicit conversion which asserts that the Tests whether this list ends with the given sequence. (Since version 2.13.0) Use concat instead. An Iterator which traverses the possible n-element combinations of this list. If an element value x appears true, if both collections contain the same elements in the same order, false otherwise. made of those values returned by f that were wrapped in scala.util.Left, and the second Note that such a read is not The implementation of this operation may operate Applies a binary operator to all elements of this list and a start value, Finds the first element which yields the largest value measured by function f. the first element of this list with the largest value measured by function f They can be used directly as shown below since their companion objects are quote. Composes this partial function with a transformation function that the target type of the transformation f, and the type where the same class as the current collection class Repr, but this Will return or Option which are accessible in all Scala compilation units without explicit qualification or Format strings are as for String.format the longest suffix of this list whose first element Returns string formatted according to given format string. Otherwise, a linear search is used. objects that rely on structural sharing), will be serialized and deserialized with multiple lists, one for The nth element of this product, 0-based. Note: might return different results for different runs, unless the

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