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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';
// MODULES //
var objectKeys = require( '@stdlib/utils/keys' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Copies and renames specified keys for every element in a provided array.
*
* ## Notes
*
* - The function only copies and renames those keys which are present in a provided mapping object. Any keys which are not present in the provided mapping object, but are present in the original objects, are omitted during object creation.
* - The function assumes that each object has the keys specified in a provided mapping object.
* - The function performs shallow copies of key values.
*
* @param {ArrayLikeObject<Object>} arr - input array
* @param {Object} mapping - object mapping existing keys to new key names
* @returns {Array<Object>} output array
*
* @example
* var x = [
* {
* 'x': 1,
* 'y': 2
* },
* {
* 'x': 3,
* 'y': 4
* }
* ];
* var mapping = {
* 'x': 'a',
* 'y': 'b'
* };
*
* var out = rekey( x, mapping );
* // returns [ { 'a': 1, 'b': 2 }, { 'a': 3, 'b': 4 } ]
*/
function rekey( arr, mapping ) {
var okeys;
var nkeys;
var get;
var out;
var obj;
var tmp;
var M;
var N;
var i;
var j;
M = arr.length;
if ( M < 1 ) {
return [];
}
// Resolve the list of old key names:
okeys = objectKeys( mapping );
N = okeys.length;
// Resolve the list of new key names:
nkeys = [];
for ( i = 0; i < N; i++ ) {
nkeys.push( mapping[ okeys[ i ] ] );
}
get = resolveGetter( arr );
out = [];
for ( i = 0; i < M; i++ ) {
tmp = get( arr, i );
obj = {};
for ( j = 0; j < N; j++ ) {
obj[ nkeys[ j ] ] = tmp[ okeys[ j ] ];
}
out.push( obj );
}
return out;
}
// EXPORTS //
module.exports = rekey;
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