feat: add iter/do-while-each

lib/node_modules/@stdlib/iter/do-while-each/README.md

@@ -0,0 +1,239 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# iterDoWhileEach
+
+> Create an iterator which, while a test condition is true, invokes a function for each iterated value before returning the iterated value.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var iterDoWhileEach = require( '@stdlib/iter/do-while-each' );
+```
+
+#### iterDoWhileEach( iterator, predicate, fcn\[, thisArg] )
+
+Returns an iterator which invokes a function for each iterated value before returning the iterated value until either a predicate function returns false or the iterator has iterated over all values. The condition is evaluated after executing the provided function (fcn).
+
+```javascript
+var iterDoWhileEach = require( '@stdlib/iter/do-while-each' );
+var array2iterator = require( '@stdlib/array/to-iterator' );
+
+function predicate( v ) {
+    return v < 3;
+}
+
+function assert( v ) {
+    if ( v !== v ) {
+        throw new Error( 'should not be NaN' );
+    }
+}
+
+var it = iterDoWhileEach( array2iterator( [ 1, 2, 3, 4 ] ), predicate, assert );
+// returns {}
+
+var r = it.next().value;
+// returns 1
+
+r = it.next().value;
+// returns 2
+
+r = it.next().value;
+// returns undefined
+
+// ...
+```
+
+The returned iterator protocol-compliant object has the following properties:
+
+-   **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.
+-   **return**: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.
+
+Both the `predicate` function and the function to invoke for each iterated value are provided two arguments:
+
+-   **value**: iterated value
+-   **index**: iteration index (zero-based)
+
+```javascript
+var iterDoWhileEach = require( '@stdlib/iter/do-while-each' );
+var array2iterator = require( '@stdlib/array/to-iterator' );
+
+function predicate( v ) {
+    return v < 3;
+}
+
+function assert( v, i ) {
+    if ( v !== v ) {
+        throw new Error( 'should not be NaN' );
+    }
+}
+
+var it = iterDoWhileEach( array2iterator( [ 1, 2, 3, 4 ] ), predicate, assert );
+// returns <Object>
+
+var r = it.next().value;
+// returns 1
+
+r = it.next().value;
+// returns 2
+
+r = it.next().value;
+// returns undefined
+// ...
+```
+
+To set the execution context for `fcn`, provide a `thisArg`.
+
+<!-- eslint-disable no-invalid-this -->
+
+```javascript
+var iterDoWhileEach = require( '@stdlib/iter/do-while-each' );
+var array2iterator = require( '@stdlib/array/to-iterator' );
+
+function assert( v ) {
+    this.count += 1;
+    if ( v !== v ) {
+        throw new Error( 'should not be NaN' );
+    }
+}
+
+function predicate( v ) {
+    return v < 3;
+}
+
+var ctx = {
+    'count': 0
+};
+
+var iterator = array2iterator( [ 1, 2, 3 ] );
+var it = iterDoWhileEach( iterator, predicate, assert, ctx );
+// returns <Object>
+
+var r = it.next().value;
+// returns 1
+
+r = it.next().value;
+// returns 2
+
+r = it.next().value;
+// returns undefined
+
+var count = ctx.count;
+// returns 3
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   If an environment supports `Symbol.iterator` **and** a provided iterator is iterable, the returned iterator is iterable.
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var randu = require( '@stdlib/random/iter/randu' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var iterDoWhileEach = require( '@stdlib/iter/do-while-each' );
+
+function assert( v ) {
+    if ( isnan( v ) ) {
+        throw new Error( 'should not be NaN' );
+    }
+}
+
+function predicate( v ) {
+    return v <= 0.75;
+}
+
+// Create a seeded iterator for generating pseudorandom numbers:
+var rand = randu({
+    'seed': 1234,
+    'iter': 10
+});
+
+// Create an iterator which validates generated numbers:
+var it = iterDoWhileEach( rand, predicate, assert );
+
+// Perform manual iteration...
+var r;
+while ( true ) {
+    r = it.next();
+    if ( r.done ) {
+        break;
+    }
+    console.log( r.value );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- 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. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

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

@@ -0,0 +1,97 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/iter/randu' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
+var pkg = require( './../package.json' ).name;
+var iterDoWhileEach = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var rand;
+	var iter;
+	var i;
+
+	rand = randu();
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		iter = iterDoWhileEach( rand, predicate, fcn );
+		if ( typeof iter !== 'object' ) {
+			b.fail( 'should return an object' );
+		}
+	}
+	b.toc();
+	if ( !isIteratorLike( iter ) ) {
+		b.fail( 'should return an iterator protocol-compliant object' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+
+	function fcn( v ) {
+		if ( isnan( v ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+
+	function predicate( v ) {
+		return ( v < 0.5 );
+	}
+});
+
+bench( pkg+'::iteration', function benchmark( b ) {
+	var rand;
+	var iter;
+	var z;
+	var i;
+
+	rand = randu();
+	iter = iterDoWhileEach( rand, predicate, fcn );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		z = iter.next().value;
+		if ( isnan( z ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( z ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+
+	function fcn( v ) {
+		if ( isnan( v ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+
+	function predicate( v ) {
+		return ( v < 0.5 );
+	}
+});

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

@@ -0,0 +1,57 @@
+
+{{alias}}( iterator, predicate, fcn[, thisArg] )
+    Returns an iterator which invokes a function for each iterated value before 
+    returning the iterated value until either a predicate function returns false
+    or the iterator has iterated over all values.
+
+    The condition is evaluated *after* executing the provided function; thus,
+    `fcn` *always* executes at least once.
+
+    When invoked, both input functions are provided two arguments:
+
+    - value: iterated value
+    - index: iteration index (zero-based)
+
+    If an environment supports Symbol.iterator, the returned iterator is
+    iterable.
+
+    Parameters
+    ----------
+    iterator: Object
+        Input iterator.
+
+    predicate: Function
+        Function which indicates whether to continue iterating.
+
+    fcn: Function
+        Function to invoke for each iterated value.
+
+    thisArg: any (optional)
+        Execution context.
+
+    Returns
+    -------
+    iterator: Object
+        Iterator.
+
+    iterator.next(): Function
+        Returns an iterator protocol-compliant object containing the next
+        iterated value (if one exists) and a boolean flag indicating whether the
+        iterator is finished.
+
+    iterator.return( [value] ): Function
+        Finishes an iterator and returns a provided value.
+
+    Examples
+    --------
+    > function predicate( v ) { return v === v };
+    > function f( v ) { if ( v !== v ) { throw new Error( 'beep' ); } };
+    > var it = {{alias}}( {{alias:@stdlib/random/iter/randu}}(), predicate, f );
+    > var r = it.next().value
+    <number>
+    > r = it.next().value
+    <number>
+
+    See Also
+    --------
+