feat: add findLast method to array/uint64

lib/node_modules/@stdlib/array/uint64/README.md

@@ -278,6 +278,40 @@ u = arr.at( -100 );
 // returns undefined
 ```
 
+<a name="method-copy-within"></a>
+
+#### Uint64Array.prototype.copyWithin( target, start\[, end] )
+
+Copies a sequence of elements within the array starting at `start` and ending at `end` (non-inclusive) to the position starting at `target`.
+
+```javascript
+var arr = new Uint64Array( [ 1, 2, 3, 4 ] );
+
+// Copy the last two elements to the first two elements:
+arr.copyWithin( 0, 2 );
+// arr => <Uint64Array>[ 3n, 4n, 3n, 4n ]
+```
+
+By default, `end` equals the number of array elements (i.e., one more than the last array index). To limit the sequence length, provide an `end` argument.
+
+```javascript
+var arr = new Uint64Array( [ 1, 2, 3, 4 ] );
+
+// Copy the first two elements to the last two elements:
+arr.copyWithin( 2, 0, 2 );
+// arr => <Uint64Array>[ 1n, 2n, 1n, 2n ]
+```
+
+When a `target`, `start`, and/or `end` index is negative, the respective index is determined relative to the last array element. The following example achieves the same behavior as the previous example:
+
+```javascript
+var arr = new Uint64Array( [ 1, 2, 3, 4 ] );
+
+// Copy the first two elements to the last two elements using negative indices:
+arr.copyWithin( -2, -4, -2 );
+// arr => <Uint64Array>[ 1n, 2n, 1n, 2n ]
+```
+
 <a name="method-entries"></a>
 
 #### Uint64Array.prototype.entries()
@@ -309,6 +343,298 @@ The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the
 -   **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][mdn-iterator-protocol] 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.
 
+<a name="method-every"></a>
+
+#### Uint64Array.prototype.every( predicate\[, thisArg] )
+
+Returns a boolean indicating whether all elements pass a test.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 2, 4, 6 ] );
+
+// Check whether all elements pass a test:
+var bool = arr.every( predicate );
+// returns true
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`.
+
+```javascript
+function predicate( v, i ) {
+    this.count += 1;
+    return ( i >= 0 );
+}
+
+var arr = new Uint64Array( [ 2, 4, 6 ] );
+
+var context = {
+    'count': 0
+};
+
+var bool = arr.every( predicate, context );
+// returns true
+
+var count = context.count;
+// returns 3
+```
+
+<a name="method-fill"></a>
+
+#### Uint64Array.prototype.fill( value\[, start\[, end]] )
+
+Fills an array from a `start` index to an `end` index (non-inclusive) with a provided `value`.
+
+```javascript
+var Uint64 = require( '@stdlib/number/uint64/ctor' );
+
+var arr = new Uint64Array( 3 );
+
+// Set all elements to the same value:
+arr.fill( new Uint64( 1 ) );
+// arr => <Uint64Array>[ 1n, 1n, 1n ]
+
+// Fill all elements starting from the second element:
+arr.fill( new Uint64( 2 ), 1 );
+// arr => <Uint64Array>[ 1n, 2n, 2n ]
+
+// Fill all elements from first element until the second-to-last element:
+arr.fill( new Uint64( 3 ), 0, 2 );
+// arr => <Uint64Array>[ 3n, 3n, 2n ]
+```
+
+When a `start` and/or `end` index is negative, the respective index is determined relative to the last array element.
+
+```javascript
+var Uint64 = require( '@stdlib/number/uint64/ctor' );
+
+var arr = new Uint64Array( 3 );
+
+// Set all array elements, except the last element, to the same value:
+arr.fill( new Uint64( 1 ), 0, -1 );
+// arr => <Uint64Array>[ 1n, 1n, 0n ]
+```
+
+<a name="method-filter"></a>
+
+#### Uint64Array.prototype.filter( predicate\[, thisArg] )
+
+Returns a new array containing the elements of an array which pass a test implemented by a predicate function.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 2, 3, 4, 5, 6 ] );
+
+var out = arr.filter( predicate );
+// returns <Uint64Array>[ 2n, 4n, 6n ]
+
+var len = out.length;
+// returns 3
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v, i ) {
+    this.count += 1;
+    return ( i >= 0 && isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 2, 3, 4, 5, 6 ] );
+
+var context = {
+    'count': 0
+};
+
+var out = arr.filter( predicate, context );
+// returns <Uint64Array>[ 2n, 4n, 6n ]
+
+var len = out.length;
+// returns 3
+
+var count = context.count;
+// returns 6
+```
+
+<a name="method-find"></a>
+
+#### Uint64Array.prototype.find( predicate\[, thisArg] )
+
+Returns the first element in an array for which a predicate function returns a truthy value.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 3, 4, 5 ] );
+
+var u = arr.find( predicate );
+// returns <Uint64>[ 4n ]
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v, i ) {
+    this.count += 1;
+    return ( i >= 0 && isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 3, 4, 5 ] );
+
+var context = {
+    'count': 0
+};
+
+var u = arr.find( predicate, context );
+// returns <Uint64>[ 4n ]
+
+var count = context.count;
+// returns 3
+```
+
+<a name="method-find-index"></a>
+
+#### Uint64Array.prototype.findIndex( predicate\[, thisArg] )
+
+Returns the index of the first element in an array for which a predicate function returns a truthy value.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 3, 4, 6 ] );
+
+var idx = arr.findIndex( predicate );
+// returns 2
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v, i ) {
+    this.count += 1;
+    return ( i >= 0 && isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 3, 5, 7 ] );
+
+var context = {
+    'count': 0
+};
+
+var idx = arr.findIndex( predicate, context );
+// returns -1
+
+var count = context.count;
+// returns 4
+```
+
+<a name="method-find-last"></a>
+
+#### Uint64Array.prototype.findLast( predicate\[, thisArg] )
+
+Returns the last element in an array for which a `predicate` function returns a truthy value.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 2, 3, 4, 5 ] );
+
+var u = arr.findLast( predicate );
+// returns <Uint64>[ 4n ]
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`.
+
+```javascript
+var isEven = require( '@stdlib/assert/is-even' ).isPrimitive;
+var Number = require( '@stdlib/number/ctor' );
+
+function predicate( v ) {
+    this.count += 1;
+    return ( isEven( Number( v ) ) );
+}
+
+var arr = new Uint64Array( [ 1, 2, 3, 4, 5 ] );
+
+var context = {
+    'count': 0
+};
+
+var u = arr.findLast( predicate, context );
+// returns <Uint64>[ 4n ]
+
+var count = context.count;
+// returns 2
+```
+
+If a `predicate` function never returns a truthy value, the method returns `undefined`.
+
 <a name="method-get"></a>
 
 #### Uint64Array.prototype.get( i )

lib/node_modules/@stdlib/array/uint64/benchmark/benchmark.copy_within.js

@@ -0,0 +1,53 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 isUint64Array = require( '@stdlib/assert/is-uint64array' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var Uint64Array = require( './../lib' );
+
+
+// MAIN //
+
+bench( format( '%s:copyWithin', pkg ), function benchmark( b ) {
+	var arr;
+	var out;
+	var i;
+
+	arr = new Uint64Array( 10 );
+
+	// Benchmark worst case scenario (i.e., copying all but one element to an overlapping region)...
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = arr.copyWithin( 1, 0 );
+		if ( typeof out !== 'object' ) {
+			b.fail( 'should return an object' );
+		}
+	}
+	b.toc();
+	if ( !isUint64Array( out ) ) {
+		b.fail( 'should return a Uint64Array' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});