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* @license Apache-2.0
*
* Copyright (c) 2018 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 //
/**
* Adds one or more elements to the beginning of an array-like object.
*
* @private
* @param {Object} obj - input array-like object
* @param {Array} items - items to add
* @returns {Object} input object
*
* @example
* var obj = {
* 'length': 2,
* '0': 1.0,
* '1': 2.0
* };
*
* obj = unshift( obj, [ 3.0, 4.0 ] );
* // returns { 'length': 4, '0': 3.0, '1': 4.0, '2': 1.0, '3': 2.0 }
*/
function unshift( obj, items ) {
var len;
var n;
var i;
len = obj.length;
n = items.length;
// Shift all existing elements to the right...
for ( i = len-1; i >= 0; i-- ) {
obj[ i+n ] = obj[ i ];
}
// Add new elements...
for ( i = 0; i < n; i++ ) {
obj[ i ] = items[ i ];
}
obj.length = len + n;
return obj;
}
// EXPORTS //
module.exports = unshift;
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