type

Range

@Serializable { simple=true } const class Range : Obj

Range represents a contiguous range of integers from start to end. Ranges may be represented as literals in Fantom source code as "start..end" for an inclusive end or "start..<end" for an exlusive range.

constructors

fromStr	Parse from string format - inclusive is "start..end", or exclusive is "start..<end".
make	Constructor with start, end, and exclusive flag (all must be non-null).
makeExclusive	Convenience for make(start, end, true).
makeInclusive	Convenience for make(start, end, false).

methods

contains	Return if this range contains the specified integer.
each	Call the specified function for each integer in the range.
eachWhile	Iterate every integer in the range until the function returns non-null.
end	Return end index.
equals	Return true if same start, end, and exclusive.
exclusive	Is the end index exclusive.
first	Get the first value of the range.
hash	Return start ^ end.
inclusive	Is the end index inclusive.
isEmpty	Return if this range contains no integer values.
last	Get the last value of the range.
map	Create a new list which is the result of calling c for every integer in the range.
max	Get the maximum value of the range.
min	Get the minimum value of the range.
offset	Create a new range by adding offset to this range's start and end values.
random	Convenience for `Int.random(this)`.
start	Return start index.
toList	Convert this range into a list of Ints.
toStr	If inclusive return "start..end", if exclusive return "start..<end".

Slot Details

contains

Bool contains(Int i)

Return if this range contains the specified integer.

Example:

(1..3).contains(2)  =>  true
(1..3).contains(4)  =>  false

each

Void each(|Int| c)

Call the specified function for each integer in the range. Also see Int.times.

Example:

(1..3).each |i| { echo(i) }          =>  1, 2, 3
(1..<3).each |i| { echo(i) }         => 1, 2
('a'..'z').each |Int i| { echo(i) }  => 'a', 'b', ... 'z'

eachWhile

Obj? eachWhile(|Int->Obj?| c)

Iterate every integer in the range until the function returns non-null. If function returns non-null, then break the iteration and return the resulting object. Return null if the function returns null for every integer in the range.

end

Int end()

Return end index.

Example:

(1..3).end  =>  3

equals

virtual override Bool equals(Obj? obj)

Return true if same start, end, and exclusive.

exclusive

Bool exclusive()

Is the end index exclusive.

Example:

(1..3).exclusive   =>  false
(1..<3).exclusive  =>  true

first

Int? first()

Get the first value of the range. If range contains no values then return null. Equivalent to toList.first.

fromStr

static new fromStr(Str s, Bool checked := true)

Parse from string format - inclusive is "start..end", or exclusive is "start..<end". If invalid format then throw ParseErr or return null based on checked flag.

hash

virtual override Int hash()

Return start ^ end.

inclusive

Bool inclusive()

Is the end index inclusive.

Example:

(1..3).inclusive   =>  true
(1..<3).inclusive  =>  false

isEmpty

Bool isEmpty()

Return if this range contains no integer values. Equivalent to toList.isEmpty.

last

Int? last()

Get the last value of the range. If range contains no values then return null. Equivalent to toList.last.

make

new make(Int start, Int end, Bool exclusive)

Constructor with start, end, and exclusive flag (all must be non-null).

makeExclusive

new makeExclusive(Int start, Int end)

Convenience for make(start, end, true).

makeInclusive

new makeInclusive(Int start, Int end)

Convenience for make(start, end, false).

map

Obj?[] map(|Int->Obj?| c)

Create a new list which is the result of calling c for every integer in the range. The new list is typed based on the return type of c.

Example:

(10..15).map |i->Str| { i.toHex }  =>  Str[a, b, c, d, e, f]

max

Int? max()

Get the maximum value of the range. If range contains no values then return null. Equivalent to toList.max.

min

Int? min()

Get the minimum value of the range. If range contains no values then return null. Equivalent to toList.min.

offset

Range offset(Int offset)

Create a new range by adding offset to this range's start and end values.

Example:

(3..5).offset(2)   =>  5..7
(3..<5).offset(-2) =>  1..<3

random

Int random()

Convenience for Int.random(this). Also see Int.random, Float.random, List.random, and Random.

start

Int start()

Return start index.

Example:

(1..3).start  =>  1

toList

Int[] toList()

Convert this range into a list of Ints.

Example:

(2..4).toList   =>  [2,3,4]
(2..<4).toList  =>  [2,3]
(10..8).toList  =>  [10,9,8]

toStr

virtual override Str toStr()

If inclusive return "start..end", if exclusive return "start..<end".