NumberLine<T extends num> class

A memory-efficient iterable sequence of numbers. Mimics C++ std::views::iota or Python's range().

Can iterate over both int and double, and the boundary condition for end is exclusive, meaning it stops before the exact requested ending.

Inheritance

Constructors

NumberLine(T start, T end, {T? step})
Creates a memory-efficient sequence from start to end exclusive, incrementing by step.

Properties

end ↔ T
The ending exclusive boundary of the sequence.
getter/setter pair
first → T
The first element.
no setterinherited
hashCode → int
The hash code for this object.
no setteroverride
isEmpty → bool
Whether this collection has no elements.
no setterinherited
isNotEmpty → bool
Whether this collection has at least one element.
no setterinherited
iterator → Iterator<T>
A new Iterator that allows iterating the elements of this Iterable.
no setteroverride
last → T
The last element.
no setterinherited
length → int
The number of elements in this Iterable.
no setteroverride
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
single → T
Checks that this iterable has only one element, and returns that element.
no setterinherited
start ↔ T
The starting inclusive boundary of the sequence.
getter/setter pair
step ↔ T
The amount or distance to step incrementally on each iteration.
getter/setter pair

Methods

any(bool test(T element)) → bool
Checks whether any element of this iterable satisfies test.
inherited
cast<R>() → Iterable<R>
A view of this iterable as an iterable of R instances.
inherited
contains(Object? element) → bool
Whether the collection contains an element equal to element.
override
elementAt(int index) → T
Returns the indexth element.
inherited
empty() → bool
Returns true if the sequence is empty.
every(bool test(T element)) → bool
Checks whether every element of this iterable satisfies test.
inherited
expand<T>(Iterable<T> toElements(T element)) → Iterable<T>
Expands each element of this Iterable into zero or more elements.
inherited
firstWhere(bool test(T element), {T orElse()?}) → T
The first element that satisfies the given predicate test.
inherited
fold<T>(T initialValue, T combine(T previousValue, T element)) → T
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
inherited
followedBy(Iterable<T> other) → Iterable<T>
Creates the lazy concatenation of this iterable and other.
inherited
forEach(void action(T element)) → void
Invokes action on each element of this iterable in iteration order.
inherited
get(int index) → T
Retrieves the element at the specified 0-based index in O(1) time.
hasValue() → bool
Returns true if the sequence has elements.
join([String separator = ""]) → String
Converts each element to a String and concatenates the strings.
inherited
lastWhere(bool test(T element), {T orElse()?}) → T
The last element that satisfies the given predicate test.
inherited
map<T>(T toElement(T e)) → Iterable<T>
The current elements of this iterable modified by toElement.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
reduce(T combine(T value, T element)) → T
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
inherited
reset() → void
Resets the sequence to its initial state.
set(T newStart, T newEnd, [T? newStep]) → void
Modifies the boundaries of this number line sequence.
singleWhere(bool test(T element), {T orElse()?}) → T
The single element that satisfies test.
inherited
skip(int count) → Iterable<T>
Creates an Iterable that provides all but the first count elements.
inherited
skipWhile(bool test(T value)) → Iterable<T>
Creates an Iterable that skips leading elements while test is satisfied.
inherited
take(int count) → Iterable<T>
Creates a lazy iterable of the count first elements of this iterable.
inherited
takeWhile(bool test(T value)) → Iterable<T>
Creates a lazy iterable of the leading elements satisfying test.
inherited
toList({bool growable = true}) → List<T>
Creates a List containing the elements of this Iterable.
inherited
toSet() → Set<T>
Creates a Set containing the same elements as this iterable.
inherited
toString() → String
Returns a string representation of (some of) the elements of this.
override
type() → Type
Returns the type argument T.
where(bool test(T element)) → Iterable<T>
Creates a new lazy Iterable with all elements that satisfy the predicate test.
inherited
whereType<T>() → Iterable<T>
Creates a new lazy Iterable with all elements that have type T.
inherited

Operators

operator %(num modulo) → NumberLine<T>
Modulo operation on sequence boundaries keeping the step intact.
operator *(num factor) → NumberLine<T>
Scales the sequence proportionally by multiplying boundaries and step by factor.
operator +(num offset) → NumberLine<T>
Shifts the sequence by adding offset consistently to boundaries.
operator -(num offset) → NumberLine<T>
Shifts the sequence by subtracting offset consistently from boundaries.
operator /(num divisor) → NumberLine<double>
Divides the sequence proportionally safely returning a NumberLine of doubles.
operator <(Iterable<T> other) → bool
Safely performs lexicographical comparison against another iterable.
operator <=(Iterable<T> other) → bool
operator ==(Object other) → bool
The equality operator.
override
operator >(Iterable<T> other) → bool
operator >=(Iterable<T> other) → bool
operator [](int index) → T
Retrieves the element at the specified 0-based index in O(1) time.
operator []=(int index, T value) → void
Unsupported. Modifying a generated mathematical sequence element by element is invalid.