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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';
// MAIN //
/**
* Returns an element from a two-dimensional nested array.
*
* @param {ArrayLikeObject<Collection>} x - input array
* @param {integer} i0 - first dimension index
* @param {integer} i1 - second dimension index
* @returns {*} nested array element
*
* @example
* var x = [ [ 1, 2 ], [ 3, 4 ] ];
*
* var v = at2d( x, 0, 1 );
* // returns 2
*
* v = at2d( x, 1, 0 );
* // returns 3
*
* v = at2d( x, -2, -2 );
* // returns 1
*/
function at2d( x, i0, i1 ) {
var x0;
var N;
N = x.length;
if ( i0 < 0 ) {
i0 += N;
}
if ( i0 < 0 || i0 >= N ) {
return;
}
x0 = x[ i0 ];
N = x0.length;
if ( i1 < 0 ) {
i1 += N;
}
if ( i1 < 0 || i1 >= N ) {
return;
}
return x0[ i1 ];
}
// EXPORTS //
module.exports = at2d;
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