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feat: add iter/do-until-each
PR-URL: #1408 Closes: #807 Reviewed-by: Philipp Burckhardt <[email protected]>
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‎lib/node_modules/@stdlib/iter/do-until-each/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2024 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# iterDoUntilEach
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> Create an iterator which, while a test condition is false, invokes a function for each iterated value before returning the iterated value.
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- Package usage documentation. -->
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<section class="usage">
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## Usage
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```javascript
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var iterDoUntilEach = require( '@stdlib/iter/do-until-each' );
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```
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#### iterDoUntilEach( iterator, predicate, fcn\[, thisArg] )
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Returns an iterator which invokes a function for each iterated value **before** returning the iterated value until either a `predicate` function returns `true` or the iterator has iterated over all values. Note that the condition is evaluated **after** executing `fcn`; thus, `fcn` **always** executes at least once.
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```javascript
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var array2iterator = require( '@stdlib/array/to-iterator' );
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function predicate( v ) {
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return v > 2;
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}
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function assert( v ) {
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if ( v !== v ) {
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throw new Error( 'should not be NaN' );
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}
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}
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var it = iterDoUntilEach( array2iterator( [ 1, 2, 3, 4 ] ), predicate, assert );
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// returns {}
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var r = it.next().value;
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// returns 1
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r = it.next().value;
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// returns 2
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r = it.next().value;
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// undefined
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// ...
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```
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The returned iterator protocol-compliant object has the following properties:
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- **next**: function which returns an iterator 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.
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- **return**: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.
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Both the `predicate` function and the function to invoke for each iterated value are provided two arguments:
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- **value**: iterated value
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- **index**: iteration index (zero-based)
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```javascript
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var array2iterator = require( '@stdlib/array/to-iterator' );
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function predicate( v ) {
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return v > 2;
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}
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function assert( v, i ) {
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if ( i > 2 ) {
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throw new Error( 'unexpected error' );
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}
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}
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var it = iterDoUntilEach( array2iterator( [ 1, 2, 3, 4 ] ), predicate, assert );
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// returns <Object>
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var r = it.next().value;
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// returns 1
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r = it.next().value;
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// returns 2
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r = it.next().value;
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// undefined
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// ...
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```
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To set the execution context for `fcn`, provide a `thisArg`.
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<!-- eslint-disable no-invalid-this -->
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```javascript
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var array2iterator = require( '@stdlib/array/to-iterator' );
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function assert( v ) {
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this.count += 1;
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if ( v !== v ) {
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throw new Error( 'should not be NaN' );
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}
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}
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function predicate( v ) {
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return v > 2;
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}
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var c = {
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'count': 0
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};
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var it = iterDoUntilEach( array2iterator( [ 1, 2, 3 ] ), predicate, assert, c );
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// returns <Object>
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var r = it.next().value;
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// returns 1
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r = it.next().value;
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// returns 2
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r = it.next().value;
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// returns undefined
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var count = c.count;
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// returns 3
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```
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</section>
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<!-- /.usage -->
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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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## Notes
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- If an environment supports `Symbol.iterator` **and** a provided iterator is iterable, the returned iterator is iterable.
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</section>
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<!-- /.notes -->
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<!-- Package usage examples. -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var randu = require( '@stdlib/random/iter/randu' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var iterDoUntilEach = require( '@stdlib/iter/do-until-each' );
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function assert( v ) {
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if ( isnan( v ) ) {
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throw new Error( 'should not be NaN' );
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}
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}
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function predicate( v ) {
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return v <= 0.75;
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}
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// Create a seeded iterator for generating pseudorandom numbers:
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var rand = randu({
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'seed': 1234,
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'iter': 10
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});
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// Create an iterator which validates generated numbers:
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var it = iterDoUntilEach( rand, predicate, assert );
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// Perform manual iteration...
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var r;
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while ( true ) {
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r = it.next();
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if ( r.done ) {
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break;
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}
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console.log( r.value );
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}
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```
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</section>
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<!-- /.examples -->
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<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="references">
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</section>
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<!-- /.references -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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</section>
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<!-- /.links -->

‎lib/node_modules/@stdlib/iter/do-until-each/benchmark/benchmark.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var randu = require( '@stdlib/random/iter/randu' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
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var pkg = require( './../package.json' ).name;
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var iterator = require( './../lib' );
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// MAIN //
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bench( pkg, function benchmark( b ) {
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var rand;
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var iter;
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var i;
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rand = randu();
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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iter = iterator( rand, predicate, fcn );
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if ( typeof iter !== 'object' ) {
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b.fail( 'should return an object' );
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}
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}
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b.toc();
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if ( !isIteratorLike( iter ) ) {
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b.fail( 'should return an iterator protocol-compliant object' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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function fcn( v ) {
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if ( isnan( v ) ) {
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b.fail( 'should not return NaN' );
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}
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}
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function predicate( v ) {
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return ( v < 0.5 );
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}
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});
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bench( pkg+'::iteration', function benchmark( b ) {
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var rand;
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var iter;
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var z;
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var i;
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rand = randu();
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iter = iterator( rand, predicate, fcn );
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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z = iter.next().value;
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if ( isnan( z ) ) {
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b.fail( 'should not return NaN' );
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}
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}
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b.toc();
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if ( isnan( z ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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function fcn( v ) {
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if ( isnan( v ) ) {
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b.fail( 'should not return NaN' );
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}
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}
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function predicate( v ) {
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return ( v < 0.5 );
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}
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});

‎lib/node_modules/@stdlib/iter/do-until-each/docs/repl.txt‎

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{{alias}}( iterator, predicate, fcn[, thisArg] )
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Returns an iterator which invokes a function for each iterated value before
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returning the iterated value until either a predicate function returns true
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or the iterator has iterated over all values.
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The condition is evaluated *after* executing the provided function; thus,
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`fcn` *always* executes at least once.
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When invoked, both input functions are provided two arguments:
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- value: iterated value
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- index: iteration index (zero-based)
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If an environment supports Symbol.iterator, the returned iterator is
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iterable.
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Parameters
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----------
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iterator: Object
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Input iterator.
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predicate: Function
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Function which indicates whether to continue iterating.
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fcn: Function
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Function to invoke for each iterated value.
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thisArg: any (optional)
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Execution context.
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Returns
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-------
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iterator: Object
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Iterator.
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iterator.next(): Function
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Returns an iterator protocol-compliant object containing the next
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iterated value (if one exists) and a boolean flag indicating whether the
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iterator is finished.
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iterator.return( [value] ): Function
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Finishes an iterator and returns a provided value.
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Examples
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--------
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> function predicate( v ) { return v !== v };
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> function f( v ) { if ( v !== v ) { throw new Error( 'beep' ); } };
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> var it = {{alias}}( {{alias:@stdlib/random/iter/randu}}(), predicate, f );
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> var r = it.next().value
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<number>
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> r = it.next().value
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<number>
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See Also
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--------
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