time-to-botec/squiggle/node_modules/@stdlib/math/iter/special/bessely1/README.md

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# 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.

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## 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 <Object>

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.

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## 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.

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## Examples

<!-- eslint no-undef: "error" -->

```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 );
}
```

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[mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol

[@stdlib/math/base/special/bessely1]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/bessely1

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