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* @license Apache-2.0
*
* Copyright (c) 2025 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 //
/**
* Inserts an element into an array.
*
* @param {Array} x - input array
* @param {integer} index - element index
* @param {*} value - value to insert
* @returns {Array} mutated input array
*
* @example
* var x = [ 1, 1, 2, 3, 3 ];
*
* var y = insertAt( x, -3, 4 );
* // returns [ 1, 1, 4, 2, 3, 3 ]
*
* var bool = ( x === y );
* // returns true
*
* @example
* var x = [ 1, 1, 2, 3, 3 ];
*
* var y = insertAt( x, -1, 4 );
* // returns [ 1, 1, 2, 3, 4, 3 ]
*
* var bool = ( x === y );
* // returns true
*
* @example
* var x = [ 1, 1, 2, 3, 3 ];
*
* var y = insertAt( x, x.length, 4 );
* // returns [ 1, 1, 2, 3, 3, 4 ]
*
* var bool = ( x === y );
* // returns true
*/
function insertAt( x, index, value ) {
var len;
var i;
len = x.length;
if ( index < 0 ) {
index += len;
if ( index < 0 ) {
index = 0;
}
} else if ( index > len ) {
index = len;
}
x.push( x[ len-1 ] );
for ( i = len-2; i >= index; i-- ) {
x[ i+1 ] = x[ i ];
}
x[ index ] = value;
return x;
}
// EXPORTS //
module.exports = insertAt;
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