232 lines
8.0 KiB
Plaintext
232 lines
8.0 KiB
Plaintext
|
|
||
|
|
{{alias}}( [options] )
|
||
|
|
Returns a readable stream for generating pseudorandom numbers on the
|
||
|
|
interval `[1, 2147483646]`.
|
||
|
|
|
||
|
|
In addition to standard readable stream events, the returned stream emits a
|
||
|
|
'state' event after internally generating `siter` pseudorandom numbers,
|
||
|
|
which is useful when wanting to deterministically capture a stream's
|
||
|
|
underlying PRNG state.
|
||
|
|
|
||
|
|
The underlying pseudorandom number generator (PRNG) is a linear congruential
|
||
|
|
pseudorandom number generator (LCG) based on Park and Miller.
|
||
|
|
|
||
|
|
The generator has a period of approximately `2.1e9`.
|
||
|
|
|
||
|
|
An LCG is fast and uses little memory. On the other hand, because the
|
||
|
|
generator is a simple LCG, the generator has recognized shortcomings. By
|
||
|
|
today's PRNG standards, the generator's period is relatively short. More
|
||
|
|
importantly, the "randomness quality" of the generator's output is lacking.
|
||
|
|
These defects make the generator unsuitable, for example, in Monte Carlo
|
||
|
|
simulations and in cryptographic applications.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
options: Object (optional)
|
||
|
|
Options.
|
||
|
|
|
||
|
|
options.objectMode: boolean (optional)
|
||
|
|
Specifies whether a stream should operate in "objectMode". Default:
|
||
|
|
false.
|
||
|
|
|
||
|
|
options.encoding: string|null (optional)
|
||
|
|
Specifies how Buffer objects should be decoded to strings. Default:
|
||
|
|
null.
|
||
|
|
|
||
|
|
options.highWaterMark: integer (optional)
|
||
|
|
Specifies the maximum number of bytes to store in an internal buffer
|
||
|
|
before ceasing to generate additional pseudorandom numbers.
|
||
|
|
|
||
|
|
options.sep: string (optional)
|
||
|
|
Separator used to join streamed data. This option is only applicable
|
||
|
|
when a stream is not in "objectMode". Default: '\n'.
|
||
|
|
|
||
|
|
options.iter: integer (optional)
|
||
|
|
Number of iterations.
|
||
|
|
|
||
|
|
options.normalized: boolean (optional)
|
||
|
|
Boolean indicating whether to return pseudorandom numbers on the
|
||
|
|
interval `[0,1)`.
|
||
|
|
|
||
|
|
options.seed: integer|ArrayLikeObject<integer> (optional)
|
||
|
|
Pseudorandom number generator seed. The seed may be either a positive
|
||
|
|
signed 32-bit integer or, for arbitrary length seeds, an array-like
|
||
|
|
object containing signed 32-bit integers.
|
||
|
|
|
||
|
|
options.state: Int32Array (optional)
|
||
|
|
Pseudorandom number generator state. If provided, the `seed` option is
|
||
|
|
ignored.
|
||
|
|
|
||
|
|
options.copy: boolean (optional)
|
||
|
|
Boolean indicating whether to copy a provided pseudorandom number
|
||
|
|
generator state. Setting this option to `false` allows sharing state
|
||
|
|
between two or more pseudorandom number generators. Setting this option
|
||
|
|
to `true` ensures that a returned iterator has exclusive control over
|
||
|
|
its internal state. Default: true.
|
||
|
|
|
||
|
|
options.siter: integer (optional)
|
||
|
|
Number of iterations after which to emit the PRNG state. Default: 1e308.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
stream: ReadableStream
|
||
|
|
Readable stream.
|
||
|
|
|
||
|
|
stream.seed: Int32Array|null
|
||
|
|
Pseudorandom number generator seed.
|
||
|
|
|
||
|
|
stream.seedLength: integer|null
|
||
|
|
Length of generator seed.
|
||
|
|
|
||
|
|
stream.state: Int32Array|null
|
||
|
|
Generator state.
|
||
|
|
|
||
|
|
stream.stateLength: integer|null
|
||
|
|
Length of generator state.
|
||
|
|
|
||
|
|
stream.byteLength: integer|null
|
||
|
|
Size (in bytes) of generator state.
|
||
|
|
|
||
|
|
Examples
|
||
|
|
--------
|
||
|
|
> function fcn( chunk ) { console.log( chunk.toString() ); };
|
||
|
|
> var opts = { 'iter': 10 };
|
||
|
|
> var s = {{alias}}( opts );
|
||
|
|
> var o = {{alias:@stdlib/streams/node/inspect-sink}}( fcn );
|
||
|
|
> s.pipe( o );
|
||
|
|
|
||
|
|
|
||
|
|
{{alias}}.factory( [options] )
|
||
|
|
Returns a function for creating readable streams which generate pseudorandom
|
||
|
|
numbers on the interval `[1, 2147483646]`.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
options.objectMode: boolean (optional)
|
||
|
|
Specifies whether a stream should operate in "objectMode". Default:
|
||
|
|
false.
|
||
|
|
|
||
|
|
options.encoding: string|null (optional)
|
||
|
|
Specifies how Buffer objects should be decoded to strings. Default:
|
||
|
|
null.
|
||
|
|
|
||
|
|
options.highWaterMark: integer (optional)
|
||
|
|
Specifies the maximum number of bytes to store in an internal buffer
|
||
|
|
before ceasing to generate additional pseudorandom numbers.
|
||
|
|
|
||
|
|
options.sep: string (optional)
|
||
|
|
Separator used to join streamed data. This option is only applicable
|
||
|
|
when a stream is not in "objectMode". Default: '\n'.
|
||
|
|
|
||
|
|
options.iter: integer (optional)
|
||
|
|
Number of iterations.
|
||
|
|
|
||
|
|
options.normalized: boolean (optional)
|
||
|
|
Boolean indicating whether to return pseudorandom numbers on the
|
||
|
|
interval `[0,1)`.
|
||
|
|
|
||
|
|
options.seed: integer|ArrayLikeObject<integer> (optional)
|
||
|
|
Pseudorandom number generator seed. The seed may be either a positive
|
||
|
|
signed 32-bit integer or, for arbitrary length seeds, an array-like
|
||
|
|
object containing signed 32-bit integers.
|
||
|
|
|
||
|
|
options.state: Int32Array (optional)
|
||
|
|
Pseudorandom number generator state. If provided, the `seed` option is
|
||
|
|
ignored.
|
||
|
|
|
||
|
|
options.copy: boolean (optional)
|
||
|
|
Boolean indicating whether to copy a provided pseudorandom number
|
||
|
|
generator state. Setting this option to `false` allows sharing state
|
||
|
|
between two or more pseudorandom number generators. Setting this option
|
||
|
|
to `true` ensures that a returned iterator has exclusive control over
|
||
|
|
its internal state. Default: true.
|
||
|
|
|
||
|
|
options.siter: integer (optional)
|
||
|
|
Number of iterations after which to emit the PRNG state. Default: 1e308.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
fcn: Function
|
||
|
|
Function for creating readable streams.
|
||
|
|
|
||
|
|
Examples
|
||
|
|
--------
|
||
|
|
> var opts = { 'objectMode': true, 'highWaterMark': 64 };
|
||
|
|
> var createStream = {{alias}}.factory( opts );
|
||
|
|
|
||
|
|
|
||
|
|
{{alias}}.objectMode( [options] )
|
||
|
|
Returns an "objectMode" readable stream for generating pseudorandom numbers
|
||
|
|
on the interval `[1, 2147483646]`.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
options: Object (optional)
|
||
|
|
Options.
|
||
|
|
|
||
|
|
options.encoding: string|null (optional)
|
||
|
|
Specifies how Buffer objects should be decoded to strings. Default:
|
||
|
|
null.
|
||
|
|
|
||
|
|
options.highWaterMark: integer (optional)
|
||
|
|
Specifies the maximum number of objects to store in an internal buffer
|
||
|
|
before ceasing to generate additional pseudorandom numbers.
|
||
|
|
|
||
|
|
options.iter: integer (optional)
|
||
|
|
Number of iterations.
|
||
|
|
|
||
|
|
options.normalized: boolean (optional)
|
||
|
|
Boolean indicating whether to return pseudorandom numbers on the
|
||
|
|
interval `[0,1)`.
|
||
|
|
|
||
|
|
options.seed: integer|ArrayLikeObject<integer> (optional)
|
||
|
|
Pseudorandom number generator seed. The seed may be either a positive
|
||
|
|
signed 32-bit integer or, for arbitrary length seeds, an array-like
|
||
|
|
object containing signed 32-bit integers.
|
||
|
|
|
||
|
|
options.state: Int32Array (optional)
|
||
|
|
Pseudorandom number generator state. If provided, the `seed` option is
|
||
|
|
ignored.
|
||
|
|
|
||
|
|
options.copy: boolean (optional)
|
||
|
|
Boolean indicating whether to copy a provided pseudorandom number
|
||
|
|
generator state. Setting this option to `false` allows sharing state
|
||
|
|
between two or more pseudorandom number generators. Setting this option
|
||
|
|
to `true` ensures that a returned iterator has exclusive control over
|
||
|
|
its internal state. Default: true.
|
||
|
|
|
||
|
|
options.siter: integer (optional)
|
||
|
|
Number of iterations after which to emit the PRNG state. Default: 1e308.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
stream: ReadableStream
|
||
|
|
Readable stream operating in "objectMode".
|
||
|
|
|
||
|
|
stream.seed: Int32Array|null
|
||
|
|
Pseudorandom number generator seed.
|
||
|
|
|
||
|
|
stream.seedLength: integer|null
|
||
|
|
Length of generator seed.
|
||
|
|
|
||
|
|
stream.state: Int32Array|null
|
||
|
|
Generator state.
|
||
|
|
|
||
|
|
stream.stateLength: integer|null
|
||
|
|
Length of generator state.
|
||
|
|
|
||
|
|
stream.byteLength: integer|null
|
||
|
|
Size (in bytes) of generator state.
|
||
|
|
|
||
|
|
Examples
|
||
|
|
--------
|
||
|
|
> function fcn( v ) { console.log( v ); };
|
||
|
|
> var opts = { 'iter': 10 };
|
||
|
|
> var s = {{alias}}.objectMode( opts );
|
||
|
|
> var o = {{alias:@stdlib/streams/node/inspect-sink}}.objectMode( fcn );
|
||
|
|
> s.pipe( o );
|
||
|
|
|
||
|
|
See Also
|
||
|
|
--------
|
||
|
|
|