# iterBessely1 > Create an [iterator][mdn-iterator-protocol] which iteratively evaluates the [Bessel function of the second kind][@stdlib/math/base/special/bessely1] of order one.
## Usage ```javascript var iterBessely1 = require( '@stdlib/math/iter/special/bessely1' ); ``` #### iterBessely1( iterator ) Returns an [iterator][mdn-iterator-protocol] which iteratively evaluates the [Bessel function of the second kind][@stdlib/math/base/special/bessely1] of order one. ```javascript var array2iterator = require( '@stdlib/array/to-iterator' ); var it = iterBessely1( array2iterator( [ 2.0, 0.0 ] ) ); // returns var r = it.next().value; // returns ~-0.10703 r = it.next().value; // returns -Infinity // ... ``` The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties: - **next**: function which returns an [iterator][mdn-iterator-protocol] 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][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.
## Notes - If an iterated value is non-numeric (including `NaN`), the returned [iterator][mdn-iterator-protocol] returns `NaN`. If non-numeric iterated values are possible, you are advised to provide an [`iterator`][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly. - If an environment supports `Symbol.iterator` **and** a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
## Examples ```javascript var uniform = require( '@stdlib/random/iter/uniform' ); var iterBessely1 = require( '@stdlib/math/iter/special/bessely1' ); // Create a seeded iterator for generating pseudorandom numbers: var rand = uniform( 0.0, 2.0, { 'seed': 1234, 'iter': 10 }); // Create an iterator which consumes the pseudorandom number iterator: var it = iterBessely1( rand ); // Perform manual iteration... var r; while ( true ) { r = it.next(); if ( r.done ) { break; } console.log( r.value ); } ```