Create an iterator which evaluates the binary logarithm for each iterated value.
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> Create an [iterator][mdn-iterator-protocol] which iteratively evaluates the [binary logarithm][@stdlib/math/base/special/log2].
``bash`
npm install @stdlib/math-iter-special-log2
`javascript`
var iterLog2 = require( '@stdlib/math-iter-special-log2' );
#### iterLog2( iterator )
Returns an [iterator][mdn-iterator-protocol] which iteratively evaluates the [binary logarithm][@stdlib/math/base/special/log2].
`javascript
var array2iterator = require( '@stdlib/array-to-iterator' );
var it = iterLog2( array2iterator( [ 4.0, 0.0, Infinity ] ) );
// returns
var r = it.next().value;
// returns 2.0
r = it.next().value;
// returns -Infinity
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.
- 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.Symbol.iterator
- If an environment supports and a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
`javascript
var uniform = require( '@stdlib/random-iter-uniform' );
var iterLog2 = require( '@stdlib/math-iter-special-log2' );
// Create a seeded iterator for generating pseudorandom numbers:
var rand = uniform( 0.0, 1000.0, {
'seed': 1234,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterator:
var it = iterLog2( rand );
// Perform manual iteration...
var r;
while ( true ) {
r = it.next();
if ( r.done ) {
break;
}
console.log( r.value );
}
`
*
- [@stdlib/math-base/special/log2][@stdlib/math/base/special/log2]: binary logarithm (base 2).
- [@stdlib/math-iter/special/log][@stdlib/math/iter/special/log]: create an iterator which computes the base b logarithm.
- [@stdlib/math-iter/special/log10][@stdlib/math/iter/special/log10]: create an iterator which evaluates the common logarithm (logarithm with base 10) for each iterated value.
- [@stdlib/math-iter/special/log1p][@stdlib/math/iter/special/log1p]: create an iterator which evaluates the natural logarithm of 1+x for each iterated value.
- [@stdlib/math-iter/special/pow][@stdlib/math/iter/special/pow]: create an iterator which evaluates the exponential function.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
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[deno-url]: https://github.com/stdlib-js/math-iter-special-log2/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-iter-special-log2/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-iter-special-log2/tree/umd
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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/log2]: https://www.npmjs.com/package/@stdlib/math-base-special-log2
[@stdlib/math/iter/special/log]: https://www.npmjs.com/package/@stdlib/math-iter-special-log
[@stdlib/math/iter/special/log10]: https://www.npmjs.com/package/@stdlib/math-iter-special-log10
[@stdlib/math/iter/special/log1p]: https://www.npmjs.com/package/@stdlib/math-iter-special-log1p
[@stdlib/math/iter/special/pow]: https://www.npmjs.com/package/@stdlib/math-iter-special-pow