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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';
// MODULES //
var isObjectLike = require( '@stdlib/assert/is-object-like' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isFunction = require( '@stdlib/assert/is-function' );
// MAIN //
/**
* Sets a nested property.
*
* @private
* @param {ObjectLike} obj - input object
* @param {Array} props - list of properties defining a key path
* @param {boolean} create - boolean indicating whether to create a path if the key path does not already exist
* @param {*} val - value to set
* @returns {boolean} boolean indicating if the property was successfully set
*/
function deepSet( obj, props, create, val ) {
var bool;
var len;
var v;
var p;
var i;
len = props.length;
bool = false;
v = obj;
for ( i = 0; i < len; i++ ) {
p = props[ i ];
if ( isObjectLike( v ) ) {
if ( !hasOwnProp( v, p ) ) {
if ( create ) {
v[ p ] = {};
} else {
break;
}
}
if ( i === len-1 ) {
if ( isFunction( val ) ) {
v[ p ] = val( v[ p ] );
} else {
v[ p ] = val;
}
bool = true;
} else {
v = v[ p ];
}
} else {
break;
}
}
return bool;
}
// EXPORTS //
module.exports = deepSet;
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