Seq.init<'T> Function (F#)
Generates a new sequence which, when iterated, will return successive elements by calling the given function, up to the given count.
Namespace/Module Path: Microsoft.FSharp.Collections.Seq
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Seq.init : int -> (int -> 'T) -> seq<'T>
// Usage:
Seq.init count initializer
Parameters
count
Type: intThe maximum number of items to generate for the sequence.
initializer
Type: int -> 'TA function that generates an item in the sequence from a given index.
Exceptions
Exception |
Condition |
|---|---|
Thrown when count is negative. |
Return Value
The result sequence.
Remarks
Each element is saved after its initialization. The function is passed the index of the item being generated.
This function is named Initialize in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Thread Safety
The returned sequence may be passed between threads safely. However, individual IEnumerator values generated from the returned sequence should not be accessed concurrently.
Example
The following example demonstrates the use of Seq.init to create a sequence of the first five multiples of 10.
let seqFirst5MultiplesOf10 = Seq.init 5 (fun n -> n * 10)
Seq.iter (fun elem -> printf "%d " elem) seqFirst5MultiplesOf10
0 10 20 30 40
Platforms
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
Version Information
F# Core Library Versions
Supported in: 2.0, 4.0, Portable