Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 an n-dimensional nested array.
*
* @param {ArrayLikeObject} x - input array
* @param {integer} i0 - first dimension index
* @param {...integer} indices - dimension indices
* @returns {*} nested array element
*
* @example
* var x = [ [ 1, 2 ], [ 3, 4 ] ];
*
* var v = atnd( x, 0, 1 );
* // returns 2
*
* v = atnd( x, 1, 0 );
* // returns 3
*
* v = atnd( x, -2, -2 );
* // returns 1
*/
function atnd( x, i0 ) {
var value;
var idx;
var N;
var i;
var j;
idx = [ i0 ];
for ( i = 2; i < arguments.length; i++ ) {
idx.push( arguments[ i ] );
}
value = x;
for ( i = 0; i < idx.length; i++ ) {
j = idx[ i ];
N = value.length;
if ( j < 0 ) {
j += N;
}
if ( j < 0 || j >= N ) {
return;
}
value = value[ j ];
}
return value;
}
// EXPORTS //
module.exports = atnd;
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