time-to-botec

README.md (5192B)

---

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 # iterLog
 
 > Create an [iterator][mdn-iterator-protocol] which iteratively computes the base `b` [logarithm][@stdlib/math/base/special/log].
 
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 <section class="usage">
 
 ## Usage
 
 ```javascript
 var iterLog = require( '@stdlib/math/iter/special/log' );
 ```
 
 #### iterLog( x, b )
 
 Returns an [iterator][mdn-iterator-protocol] which iteratively computes the base `b` [logarithm][@stdlib/math/base/special/log] of `x`.
 
 ```javascript
 var array2iterator = require( '@stdlib/array/to-iterator' );
 
 var x = array2iterator( [ 2.0, 2.0, 10.0 ] );
 var y = array2iterator( [ 2.0, 6.0, 2.0 ] );
 
 var it = iterLog( x, y );
 // returns <Object>
 
 var r = it.next().value;
 // returns 1.0
 
 r = it.next().value;
 // returns ~0.3869
 
 r = it.next().value;
 // returns ~3.3219
 
 // ...
 ```
 
 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.
 
 If provided a numeric value as an [`iterator`][mdn-iterator-protocol] argument, the value is broadcast as an **infinite** [iterator][mdn-iterator-protocol] which **always** returns the provided value.
 
 ```javascript
 var array2iterator = require( '@stdlib/array/to-iterator' );
 
 var x = array2iterator( [ 2.0, 6.0 ] );
 
 var it = iterLog( x, 2.0 );
 // returns <Object>
 
 var v = it.next().value;
 // returns 1.0
 
 v = it.next().value;
 // returns ~2.58496
 
 var bool = it.next().done;
 // returns true
 ```
 
 </section>
 
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 <section class="notes">
 
 ## Notes
 
 -   For negative `b` or `x` iterated values, the returned [iterator][mdn-iterator-protocol] returns `NaN`.
 -   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.
 -   The length of the returned [iterator][mdn-iterator-protocol] is equal to the length of the shortest provided [iterator][mdn-iterator-protocol]. In other words, the returned [iterator][mdn-iterator-protocol] ends once **one** of the provided [iterators][mdn-iterator-protocol] ends.
 -   If an environment supports `Symbol.iterator` **and** a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
 
 </section>
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var uniform = require( '@stdlib/random/iter/uniform' );
 var iterLog = require( '@stdlib/math/iter/special/log' );
 
 // Create seeded iterators for generating pseudorandom numbers:
 var x = uniform( 0.0, 100.0, {
     'seed': 1234,
     'iter': 10
 });
 
 var y = uniform( 0.0, 10.0, {
     'seed': 4567,
     'iter': 10
 });
 
 // Create an iterator which consumes the pseudorandom number iterators:
 var it = iterLog( x, y );
 
 // Perform manual iteration...
 var r;
 while ( true ) {
     r = it.next();
     if ( r.done ) {
         break;
     }
     console.log( r.value );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 <section class="links">
 
 [mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol
 
 [@stdlib/math/base/special/log]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/log
 
 </section>
 
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