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12 changes: 7 additions & 5 deletions CHANGELOG.md
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<section class="release" id="unreleased">

## Unreleased (2024-11-28)
## Unreleased (2024-11-30)

<section class="packages">

Expand Down Expand Up @@ -481,6 +481,7 @@ This release closes the following issue:

##### Features

- [`c8143c4`](https://github.com/stdlib-js/stdlib/commit/c8143c4f1f5254c67916bb1548aa5443d282e263) - add `lastIndexOf` method to `array/fixed-endian-factory` [(#3281)](https://github.com/stdlib-js/stdlib/pull/3281)
- [`9db1815`](https://github.com/stdlib-js/stdlib/commit/9db181520dc74f28aab70a73aac64202cf7560ce) - add `indexOf` method to `array/fixed-endian-factory` [(#3279)](https://github.com/stdlib-js/stdlib/pull/3279)
- [`1d217ba`](https://github.com/stdlib-js/stdlib/commit/1d217bad1d35210a57d65c8be67c596815589082) - add `map` method to `array/fixed-endian-factory` [(#3270)](https://github.com/stdlib-js/stdlib/pull/3270)
- [`2df0e9b`](https://github.com/stdlib-js/stdlib/commit/2df0e9bb08b8ad1c573b7c2383ef39e492dd5436) - add `some` method to `array/fixed-endian-factory` [(#3241)](https://github.com/stdlib-js/stdlib/pull/3241)
Expand All @@ -496,9 +497,9 @@ This release closes the following issue:

##### Closed Issues

A total of 5 issues were closed in this release:
A total of 6 issues were closed in this release:

[#3135](https://github.com/stdlib-js/stdlib/issues/3135), [#3138](https://github.com/stdlib-js/stdlib/issues/3138), [#3146](https://github.com/stdlib-js/stdlib/issues/3146), [#3150](https://github.com/stdlib-js/stdlib/issues/3150), [#3155](https://github.com/stdlib-js/stdlib/issues/3155)
[#3135](https://github.com/stdlib-js/stdlib/issues/3135), [#3138](https://github.com/stdlib-js/stdlib/issues/3138), [#3146](https://github.com/stdlib-js/stdlib/issues/3146), [#3149](https://github.com/stdlib-js/stdlib/issues/3149), [#3150](https://github.com/stdlib-js/stdlib/issues/3150), [#3155](https://github.com/stdlib-js/stdlib/issues/3155)

</section>

Expand Down Expand Up @@ -552,9 +553,9 @@ A total of 5 issues were closed in this release:

### Closed Issues

A total of 12 issues were closed in this release:
A total of 13 issues were closed in this release:

[#3135](https://github.com/stdlib-js/stdlib/issues/3135), [#3138](https://github.com/stdlib-js/stdlib/issues/3138), [#3146](https://github.com/stdlib-js/stdlib/issues/3146), [#3150](https://github.com/stdlib-js/stdlib/issues/3150), [#3155](https://github.com/stdlib-js/stdlib/issues/3155), [#3164](https://github.com/stdlib-js/stdlib/issues/3164), [#3165](https://github.com/stdlib-js/stdlib/issues/3165), [#3176](https://github.com/stdlib-js/stdlib/issues/3176), [#3177](https://github.com/stdlib-js/stdlib/issues/3177), [#3178](https://github.com/stdlib-js/stdlib/issues/3178), [#3179](https://github.com/stdlib-js/stdlib/issues/3179), [#3180](https://github.com/stdlib-js/stdlib/issues/3180)
[#3135](https://github.com/stdlib-js/stdlib/issues/3135), [#3138](https://github.com/stdlib-js/stdlib/issues/3138), [#3146](https://github.com/stdlib-js/stdlib/issues/3146), [#3149](https://github.com/stdlib-js/stdlib/issues/3149), [#3150](https://github.com/stdlib-js/stdlib/issues/3150), [#3155](https://github.com/stdlib-js/stdlib/issues/3155), [#3164](https://github.com/stdlib-js/stdlib/issues/3164), [#3165](https://github.com/stdlib-js/stdlib/issues/3165), [#3176](https://github.com/stdlib-js/stdlib/issues/3176), [#3177](https://github.com/stdlib-js/stdlib/issues/3177), [#3178](https://github.com/stdlib-js/stdlib/issues/3178), [#3179](https://github.com/stdlib-js/stdlib/issues/3179), [#3180](https://github.com/stdlib-js/stdlib/issues/3180)

</section>

Expand Down Expand Up @@ -585,6 +586,7 @@ A total of 8 people contributed to this release. Thank you to the following cont

<details>

- [`c8143c4`](https://github.com/stdlib-js/stdlib/commit/c8143c4f1f5254c67916bb1548aa5443d282e263) - **feat:** add `lastIndexOf` method to `array/fixed-endian-factory` [(#3281)](https://github.com/stdlib-js/stdlib/pull/3281) _(by Aditya Sapra, Philipp Burckhardt)_
- [`9818fa6`](https://github.com/stdlib-js/stdlib/commit/9818fa6dd8c90e045a147bfd1ba83cb1f693d17b) - **feat:** update namespace TypeScript declarations [(#3259)](https://github.com/stdlib-js/stdlib/pull/3259) _(by stdlib-bot, Philipp Burckhardt)_
- [`9db1815`](https://github.com/stdlib-js/stdlib/commit/9db181520dc74f28aab70a73aac64202cf7560ce) - **feat:** add `indexOf` method to `array/fixed-endian-factory` [(#3279)](https://github.com/stdlib-js/stdlib/pull/3279) _(by Aditya Sapra, Athan Reines)_
- [`1d217ba`](https://github.com/stdlib-js/stdlib/commit/1d217bad1d35210a57d65c8be67c596815589082) - **feat:** add `map` method to `array/fixed-endian-factory` [(#3270)](https://github.com/stdlib-js/stdlib/pull/3270) _(by Aayush Khanna, Athan Reines)_
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32 changes: 32 additions & 0 deletions fixed-endian-factory/README.md
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Expand Up @@ -515,6 +515,38 @@ var idx = arr.indexOf( 5.0 );
// returns -1
```

<a name="method-last-index-of"></a>

#### TypedArrayFE.prototype.lastIndexOf( searchElement\[, fromIndex] )

Returns the last index at which a given element can be found in the array.

```javascript
var Float64ArrayFE = fixedEndianFactory( 'float64' );

var arr = new Float64ArrayFE( 'little-endian', [ 1.0, 2.0, 3.0, 4.0, 2.0 ] );

var idx = arr.lastIndexOf( 2.0 );
// returns 4

idx = arr.lastIndexOf( 2.0, 3 );
// returns 1

idx = arr.lastIndexOf( 2.0, -2 );
// returns 1
```

If `searchElement` is not present in the array, the method returns `-1`.

```javascript
var Float64ArrayFE = fixedEndianFactory( 'float64' );

var arr = new Float64ArrayFE( 'little-endian', [ 1.0, 2.0, 3.0, 4.0, 2.0 ] );

var idx = arr.lastIndexOf( 5.0 );
// returns -1
```

<a name="method-map"></a>

#### TypedArray.prototype.map( callbackFn\[, thisArg] )
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56 changes: 56 additions & 0 deletions fixed-endian-factory/benchmark/benchmark.last-index-of.js
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@@ -0,0 +1,56 @@
/**
* @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 isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var factory = require( './../lib' );
var pkg = require( './../package.json' ).name;


// VARIABLES //

var Float64ArrayFE = factory( 'float64' );


// MAIN //

bench( pkg+':lastIndexOf', function benchmark( b ) {
var arr;
var idx;
var i;

arr = new Float64ArrayFE( 'little-endian', [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 ] );

b.tic();
for ( i = 0; i < b.iterations; i++ ) {
idx = arr.lastIndexOf( 5.0, arr.length - 1 );
if ( typeof idx !== 'number' ) {
b.fail( 'should return an integer' );
}
}
b.toc();
if ( !isInteger( idx ) ) {
b.fail( 'should return an integer' );
}
b.pass( 'benchmark finished' );
b.end();
});
103 changes: 103 additions & 0 deletions fixed-endian-factory/benchmark/benchmark.last-index-of.length.js
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/**
* @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 pow = require( '@stdlib/math/base/special/pow' );
var zeroTo = require( './../../zero-to' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var factory = require( './../lib' );
var pkg = require( './../package.json' ).name;


// VARIABLES //

var Float64ArrayFE = factory( 'float64' );


// FUNCTIONS //

/**
* Creates a benchmark function.
*
* @private
* @param {PositiveInteger} len - array length
* @returns {Function} benchmark function
*/
function createBenchmark( len ) {
var arr = new Float64ArrayFE( 'little-endian', zeroTo( len ) );
return benchmark;

/**
* Benchmark function.
*
* @private
* @param {Benchmark} b - benchmark instance
*/
function benchmark( b ) {
var idx;
var v;
var i;

v = len - 1;

b.tic();
for ( i = 0; i < b.iterations; i++ ) {
idx = arr.lastIndexOf( v );
if ( typeof idx !== 'number' ) {
b.fail( 'should return an integer' );
}
}
b.toc();
if ( !isInteger( idx ) ) {
b.fail( 'should return an integer' );
}
b.pass( 'benchmark finished' );
b.end();
}
}


// MAIN //

/**
* Main execution sequence.
*
* @private
*/
function main() {
var len;
var min;
var max;
var f;
var i;

min = 1; // 10^min
max = 6; // 10^max

for ( i = min; i <= max; i++ ) {
len = pow( 10, i );
f = createBenchmark( len );
bench( pkg+':lastIndexOf:len='+len, f );
}
}

main();
45 changes: 45 additions & 0 deletions fixed-endian-factory/lib/main.js
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Expand Up @@ -676,6 +676,51 @@ function factory( dtype ) { // eslint-disable-line max-lines-per-function, stdli
return -1;
});

/**
* Returns the index of the last occurrence of a given element.
*
* @private
* @name lastIndexOf
* @memberof TypedArray.prototype
* @type {Function}
* @param {*} searchElement - element to search for
* @param {integer} [fromIndex=this._length-1] - starting index (inclusive)
* @throws {TypeError} `this` must be a typed array instance
* @throws {TypeError} second argument must be an integer
* @returns {integer} index or -1
*/
setReadOnly( TypedArray.prototype, 'lastIndexOf', function lastIndexOf( searchElement, fromIndex ) {
var buf;
var i;

if ( !isTypedArray( this ) ) {
throw new TypeError( format( 'invalid invocation. `this` is not %s %s.', CHAR2ARTICLE[ dtype[ 0 ] ], CTOR_NAME ) );
}
if ( arguments.length > 1 ) {
if ( !isInteger( fromIndex ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an integer. Value: `%s`.', fromIndex ) );
}
if ( fromIndex < 0 ) {
fromIndex += this._length;
}
if ( fromIndex < 0 ) {
return -1;
}
if ( fromIndex >= this._length ) {
fromIndex = this._length - 1;
}
} else {
fromIndex = this._length - 1;
}
buf = this._buffer;
for ( i = fromIndex; i >= 0; i-- ) {
if ( buf[ GETTER ]( i * BYTES_PER_ELEMENT, this._isLE ) === searchElement ) {
return i;
}
}
return -1;
});

/**
* Number of array elements.
*
Expand Down
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