time-to-botec/js/node_modules/@stdlib/math/iter/special/trunc10/README.md

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@license Apache-2.0
Copyright (c) 2020 The Stdlib Authors.
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# iterTrunc10
> Create an [iterator][mdn-iterator-protocol] which [rounds][@stdlib/math/base/special/trunc10] each iterated value to the nearest power of 10 toward zero.
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</section>
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<section class="usage">
## Usage
```javascript
var iterTrunc10 = require( '@stdlib/math/iter/special/trunc10' );
```
#### iterTrunc10( iterator )
Returns an [iterator][mdn-iterator-protocol] which [rounds][@stdlib/math/base/special/trunc10] each iterated value to the nearest power of `10` toward zero.
```javascript
var array2iterator = require( '@stdlib/array/to-iterator' );
var it = iterTrunc10( array2iterator( [ 9.5, 13.0, -13.0 ] ) );
// returns <Object>
var r = it.next().value;
// returns 1.0
r = it.next().value;
// returns 10.0
r = it.next().value;
// returns -10.0
// ...
```
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 iterTrunc10 = require( '@stdlib/math/iter/special/trunc10' );
// Create a seeded iterator for generating pseudorandom numbers:
var rand = uniform( -200.0, 200.0, {
'seed': 1234,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterator:
var it = iterTrunc10( rand );
// Perform manual iteration...
var r;
while ( true ) {
r = it.next();
if ( r.done ) {
break;
}
console.log( r.value );
}
```
</section>
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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/trunc10]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/trunc10
</section>
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