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iterAdvance
Advance an iterator.
Installation
npm install @stdlib/iter-advance
Usage
var iterAdvance = require( '@stdlib/iter-advance' );
iterAdvance( iterator[, n] )
Eagerly advances and returns a provided iterator
.
var array2iterator = require( '@stdlib/array-to-iterator' );
var arr = array2iterator( [ 0, 0, 0, 0, 1 ] );
var it = iterAdvance( arr );
var bool = ( it === arr );
// returns true
var v = it.next().done;
// returns true
By default, the function eagerly consumes an entire iterator
(i.e., n == 1e308
). To limit the number of iterations, provide a second argument.
var array2iterator = require( '@stdlib/array-to-iterator' );
var arr = array2iterator( [ 0, 0, 0, 0, 1 ] );
var it = iterAdvance( arr, 4 );
var bool = ( it === arr );
// returns true
var v = it.next().value;
// returns 1
bool = it.next().done;
// returns true
Notes
-
The function eagerly advances an input iterator
n
iterations or until the inputiterator
finishes, whichever comes first. -
This function is equivalent to performing manual iteration using a
while
loop.var array2iterator = require( '@stdlib/array-to-iterator' ); var arr = array2iterator( [ 0, 0, 0, 0, 1 ] ); var i = 0; var v; while ( i < 4 ) { v = arr.next(); if ( v.done ) { break; } i += 1; } v = arr.next().value; // returns 1 var bool = arr.next().done; // returns true
Examples
var randu = require( '@stdlib/random-iter-randu' );
var iterLength = require( '@stdlib/iter-length' );
var iterAdvance = require( '@stdlib/iter-advance' );
// Create an iterator which generates uniformly distributed pseudorandom numbers:
var opts = {
'iter': 100
};
var it1 = randu( opts );
// Discard the first 10 values:
var it2 = iterAdvance( it1, 10 );
// Determine the iterator length:
var len = iterLength( it2 );
// returns 90
See Also
-
@stdlib/iter-head
: create an iterator which returns the firstn
values of a provided iterator. -
@stdlib/iter-slice
: create an iterator which returns a subsequence of iterated values from a provided iterator.
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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.