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Add traverse to Option #1

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mperry wants to merge 4 commits into from
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Add traverse to Option #1

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62d7932
fix Option#fromNull javadoc
daneko Jan 9, 2015
7f8330b
Merge pull request #73 from daneko/master
mperry Jan 15, 2015
abaf0ad
Add List.isSingle()
dobesv Jan 16, 2015
18ae251
Merge pull request #84 from dobesv/list-issingle
mperry Jan 16, 2015
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7 changes: 7 additions & 0 deletions core/src/main/java/fj/data/List.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1840,4 +1840,11 @@ private void copy() {
@Override public String toString() {
return Show.listShow( Show.<A>anyShow() ).show( this ).foldLeft((s, c) -> s + c, "" );
}

/**
* True if and only if the list has one element. Runs in constant time.
*/
public boolean isSingle() {
return isNotEmpty() && tail().isEmpty();
}
}
4 changes: 2 additions & 2 deletions core/src/main/java/fj/data/Option.java
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Expand Up @@ -683,7 +683,7 @@ public static <T> Option<T> none() {
* return none, otherwise, return the given value in some.
*
* @param t The unsafe nullable value.
* @return If <code>t == null</code> then return it in some, otherwise, return none.
* @return If <code>t == null</code> then return none, otherwise, return it in some.
*/
public static <T> Option<T> fromNull(final T t) {
return t == null ? Option.<T>none() : some(t);
Expand All @@ -693,7 +693,7 @@ public static <T> Option<T> fromNull(final T t) {
* Turns an unsafe nullable value into a safe optional value. If <code>t == null</code> then
* return none, otherwise, return the given value in some.
*
* @return If <code>t == null</code> then return it in some, otherwise, return none.
* @return If <code>t == null</code> then return none, otherwise, return it in some.
*/
public static <T> F<T, Option<T>> fromNull() {
return t -> fromNull(t);
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