@stdlib/math-iter-sequences-negafibonacci
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    0.0.7 • Public • Published

    iterNegaFibonacciSeq

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    Create an iterator which generates a negaFibonacci sequence.

    The negaFibonacci numbers are the integer sequence

    NegaFibonacci sequence

    The sequence is defined by the recurrence relation

    NegaFibonacci sequence recurrence relation

    which yields

    NegaFibonacci relationship to Fibonacci numbers

    with seed values F_0 = 0 and F_{-1} = 1.

    Installation

    npm install @stdlib/math-iter-sequences-negafibonacci

    Usage

    var iterNegaFibonacciSeq = require( '@stdlib/math-iter-sequences-negafibonacci' );

    iterNegaFibonacciSeq( [options] )

    Returns an iterator which generates a negaFibonacci sequence.

    var it = iterNegaFibonacciSeq();
    // returns <Object>
    
    var v = it.next().value;
    // returns 0
    
    v = it.next().value;
    // returns 1
    
    v = it.next().value;
    // returns -1
    
    // ...

    The returned iterator protocol-compliant object has the following properties:

    • next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
    • return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

    The function supports the following options:

    • iter: number of iterations. Default: 79.

    The returned iterator can only generate the first 79 negaFibonacci numbers, as larger Fibonacci numbers cannot be safely represented in double-precision floating-point format. By default, the function returns an iterator which generates all 79 numbers. To limit the number of iterations, set the iter option.

    var opts = {
        'iter': 2
    };
    var it = iterNegaFibonacciSeq( opts );
    // returns <Object>
    
    var v = it.next().value;
    // returns 0
    
    v = it.next().value;
    // returns 1
    
    var bool = it.next().done;
    // returns true

    Notes

    • If an environment supports Symbol.iterator, the returned iterator is iterable.

    Examples

    var iterNegaFibonacciSeq = require( '@stdlib/math-iter-sequences-negafibonacci' );
    
    // Create an iterator:
    var it = iterNegaFibonacciSeq();
    
    // Perform manual iteration...
    var v;
    while ( true ) {
        v = it.next();
        if ( v.done ) {
            break;
        }
        console.log( v.value );
    }

    See Also


    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/math-iter-sequences-negafibonacci

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    64

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    63.3 kB

    Total Files

    13

    Last publish

    Collaborators

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