102 lines
2.5 KiB
JavaScript
102 lines
2.5 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isObjectLike = require( '@stdlib/assert/is-object-like' );
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var isArray = require( '@stdlib/assert/is-array' );
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var copy = require( './../../copy' );
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var validate = require( './validate.js' );
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var defaults = require( './defaults.json' );
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var dget = require( './dget.js' );
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// MAIN //
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/**
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* Returns a nested property value.
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*
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* @param {ObjectLike} obj - input object
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* @param {(string|Array)} path - key path
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* @param {Options} [options] - function options
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* @param {string} [options.sep='.'] - key path separator
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* @throws {TypeError} second argument must be a string primitive or key array
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} must provide valid options
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* @returns {*} nested property value
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*
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* @example
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* var obj = { 'a': { 'b': { 'c': 'd' } } };
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* var val = deepGet( obj, 'a.b.c' );
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* // returns 'd'
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*
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* @example
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* var arr = [
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* { 'a': [ {'x': 5} ] },
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* { 'a': [ {'x': 10} ] }
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* ];
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* var val = deepGet( arr, '1.a.0.x' );
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* // returns 10
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*
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* @example
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* var obj = { 'a': { 'b': { 'c': 'd' } } };
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* var val = deepGet( obj, ['a','b','c'] );
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* // returns 'd'
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*
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* @example
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* var obj = { 'a': { 'b': { 'c': 'd' } } };
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* var val = deepGet( obj, 'a/b/c', {
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* 'sep': '/'
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* });
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* // returns 'd'
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*/
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function deepGet( obj, path, options ) {
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var isStr;
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var props;
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var opts;
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var err;
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if ( !isObjectLike( obj ) ) {
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return;
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}
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isStr = isString( path );
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if ( !isStr && !isArray( path ) ) {
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throw new TypeError( 'invalid argument. Key path must be a string primitive or a key array. Value: `' + path + '`.' );
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}
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opts = copy( defaults );
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if ( arguments.length > 2 ) {
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err = validate( opts, options );
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if ( err ) {
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throw err;
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}
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}
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if ( isStr ) {
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props = path.split( opts.sep );
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} else {
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props = path;
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}
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return dget( obj, props );
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}
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// EXPORTS //
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module.exports = deepGet;
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