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* @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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var getShape = require( '@stdlib/ndarray/shape' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Returns the index of the first truthy element along an ndarray dimension.
*
* ## Notes
*
* - If unable to find a truthy element along an ndarray dimension, the corresponding element in the returned ndarray is `-1`.
* - The function explicitly treats `NaN` values as falsy.
*
* @param {ndarrayLike} x - input ndarray
* @param {Options} [options] - function options
* @param {integer} [options.dim=-1] - dimension over which to perform operation
* @param {boolean} [options.keepdims=false] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
* @param {*} [options.dtype] - output ndarray data type
* @throws {TypeError} first argument must be an ndarray-like object
* @throws {TypeError} options argument must be an object
* @throws {RangeError} dimension index must not exceed input ndarray bounds
* @throws {RangeError} first argument must have at least one dimension
* @throws {Error} must provide valid options
* @returns {ndarray} output ndarray
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var ndarray = require( '@stdlib/ndarray/ctor' );
*
* // Create a data buffer:
* var xbuf = new Float64Array( [ 0.0, 2.0, 0.0, 4.0, 0.0, 6.0 ] );
*
* // Define the shape of the input array:
* var sh = [ 2, 3 ];
*
* // Define the array strides:
* var sx = [ 3, 1 ];
*
* // Define the index offset:
* var ox = 0;
*
* // Create an input ndarray:
* var x = new ndarray( 'float64', xbuf, sh, sx, ox, 'row-major' );
*
* // Perform operation:
* var out = indexOfTruthy( x );
* // returns <ndarray>[ 1, 0 ]
*/
function indexOfTruthy( x, options ) {
var opts;
var sh;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
// Initialize an options object:
opts = {
'dims': [ -1 ], // default behavior is to perform a reduction over the last dimension
'keepdims': false
};
if ( arguments.length > 1 ) {
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
// Resolve provided options...
if ( hasOwnProp( options, 'dim' ) ) {
opts.dims[ 0 ] = options.dim;
}
if ( hasOwnProp( options, 'keepdims' ) ) {
opts.keepdims = options.keepdims;
}
if ( hasOwnProp( options, 'dtype' ) ) {
opts.dtype = options.dtype;
}
}
sh = getShape( x );
if ( sh.length < 1 ) {
throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
}
return base( x, opts );
}
// EXPORTS //
module.exports = indexOfTruthy;
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