Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 objectKeys = require( '@stdlib/utils/keys' );
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Invokes a function once for each own enumerable property of an object.
*
* ## Notes
*
* - Iteration order is **not** guaranteed.
*
* @param {Object} obj - input object
* @param {Function} fcn - function to invoke
* @param {*} [thisArg] - execution context
* @throws {TypeError} first argument must be an object
* @throws {TypeError} second argument must be a function
* @returns {Object} obj - input object
*
* @example
* function log( v, key ) {
* console.log( '%s: %d', key, v );
* }
*
* var obj = {
* 'a': 1,
* 'b': 2,
* 'c': 3,
* 'd': 4
* };
*
* forOwn( obj, log );
*/
function forOwn( obj, fcn, thisArg ) {
var keys;
var bool;
var len;
var k;
var i;
if ( typeof obj !== 'object' || obj === null ) {
throw new TypeError( format( 'invalid argument. First argument must be an object. Value: `%s`.', obj ) );
}
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', fcn ) );
}
keys = objectKeys( obj );
len = keys.length;
for ( i = 0; i < len; i++ ) {
k = keys[ i ];
bool = fcn.call( thisArg, obj[ k ], k, obj );
if ( bool === false ) {
return obj;
}
}
return obj;
}
// EXPORTS //
module.exports = forOwn;
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