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/**
* @license Apache-2.0
*
* Copyright (c) 2019 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 properties = require( '@stdlib/utils/properties' );
// MAIN //
/**
* Searches a strided array-like object for a value having an **own** property whose value is equal to a provided search value and is **not** a property value for any other value in the search array.
*
* ## Notes
*
* - The returned three-element array has the following elements:
*
* - `0`: found value
* - `1`: associated property name
* - `2`: value index
*
* @private
* @param {NonNegativeInteger} N - number of elements to search
* @param {ArrayLike} arr - array to search
* @param {integer} stride - index stride
* @param {NonNegativeInteger} offset - index offset
* @param {*} value - search value
* @returns {(Array|null)} search results or null
*/
function findUniqueEntry( N, arr, stride, offset, value ) {
var props;
var idx;
var out;
var FLG;
var v;
var i;
var j;
idx = offset;
FLG = false;
for ( i = 0; i < N; i++ ) {
v = arr[ idx ];
props = properties( v );
for ( j = 0; j < props.length; j++ ) {
if ( v[ props[ j ] ] === value ) {
if ( FLG ) {
return null;
}
out = [ v, props[ j ], idx ];
FLG = true;
}
}
idx += stride;
}
if ( out ) {
return out;
}
return null;
}
// EXPORTS //
module.exports = findUniqueEntry;
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