New option scala
an option value containing the first element of this iterable collection with the largest value measured by function f with respect to the ordering cmp.
Options in Scala | James Willett
The method as implemented here does not call size directly its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -6.
Scala Standard Library
Returns a new iterable collection containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the iterable collection is the most specific superclass encompassing the element types of the two operands.
a string representation of this iterable collection. In the resulting string the string representations (. the method toString ) of all elements of this iterable collection follow each other without any separator string.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p) , provided the evaluation of the predicate p does not cause any side-effects.
a new collection of type That containing pairs consisting of corresponding elements of this iterable collection and that. The length of the returned collection is the maximum of the lengths of this iterable collection and that. If this iterable collection is shorter than that , thisElem values are used to pad the result. If that is shorter than this iterable collection, thatElem values are used to pad the result.
Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true . However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.
a new iterable collection containing pairs consisting of corresponding elements of this iterable collection and that. The length of the returned collection is the minimum of the lengths of this iterable collection and that.
A method that should be called from every well-designed equals method that is open to be overridden in a subclass. See Programming in Scala, Chapter 78 for discussion and design.
As shown, your method should be declared to return an Either , and the method body should return a Right on success and a Left on failure. The Right type is the type your method returns when it runs successfully (an Int in this case), and the Left type is typically a String , because that&rsquo s how the error message is returned.
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The return type of connectionStatus is Option [ String ] . If connection is there, then the connectionStatus will contain the connectivity of connection.
Applies a function f to each element of the iterable collection and returns a pair of iterable collections: the first one made of those values returned by f that were wrapped in , and the second one made of those wrapped in .
a iterable collection containing the elements greater than or equal to index from extending up to (but not including) index until of this iterable collection.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
If the code in question is a class or method definition, and no ExecutionContext is available, request one from the caller by adding an implicit parameter list:
Prior to Scala , an approach similar to Try was available with the Either , Left , and Right classes. With these classes, Either is analogous to Try , Right is similar to Success , and Left is similar to Failure.
If you design your API To return options, then the end user doesn’t need to worry about wrapping them in Option when they call them (as we did previously).
a new iterable collection consisting of all elements of this iterable collection that do not satisfy the given predicate pred. Their order may not be preserved.