| Package | Description | 
|---|---|
| java.util.function | 
 Functional interfaces provide target types for lambda expressions
 and method references. 
 | 
| java.util.stream | 
 Classes to support functional-style operations on streams of elements, such
 as map-reduce transformations on collections. 
 | 
| Modifier and Type | Method and Description | 
|---|---|
default DoubleUnaryOperator | 
DoubleUnaryOperator.andThen(DoubleUnaryOperator after)
Returns a composed operator that first applies this operator to
 its input, and then applies the  
after operator to the result. | 
default DoubleUnaryOperator | 
DoubleUnaryOperator.compose(DoubleUnaryOperator before)
Returns a composed operator that first applies the  
before
 operator to its input, and then applies this operator to the result. | 
static DoubleUnaryOperator | 
DoubleUnaryOperator.identity()
Returns a unary operator that always returns its input argument. 
 | 
| Modifier and Type | Method and Description | 
|---|---|
default DoubleUnaryOperator | 
DoubleUnaryOperator.andThen(DoubleUnaryOperator after)
Returns a composed operator that first applies this operator to
 its input, and then applies the  
after operator to the result. | 
default DoubleUnaryOperator | 
DoubleUnaryOperator.compose(DoubleUnaryOperator before)
Returns a composed operator that first applies the  
before
 operator to its input, and then applies this operator to the result. | 
| Modifier and Type | Method and Description | 
|---|---|
static DoubleStream | 
DoubleStream.iterate(double seed,
       DoubleUnaryOperator f)
Returns an infinite sequential ordered  
DoubleStream produced by iterative
 application of a function f to an initial element seed,
 producing a Stream consisting of seed, f(seed),
 f(f(seed)), etc. | 
DoubleStream | 
DoubleStream.map(DoubleUnaryOperator mapper)
Returns a stream consisting of the results of applying the given
 function to the elements of this stream. 
 | 
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