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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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
// MAIN //
/**
* Splits values into two groups according to a predicate function and outputs results as key-value values.
*
* ## Notes
*
* - We need to cache the object value to prevent the edge case where, during the invocation of the predicate function, the value at key `k` is swapped for some other value. For some, that might be a feature; here, we take the stance that one should be less clever.
*
* @private
* @param {(Object|Array|TypedArray)} obj - input object
* @param {Options} opts - function options
* @param {*} [opts.thisArg] - execution context
* @param {Function} predicate - predicate function indicating which group an element in the input object belongs to
* @returns {(Array<Array>|Array)} results
*
* @example
* function predicate( v ) {
* return v[ 0 ] === 'b';
* }
* var obj = {
* 'a': 'beep',
* 'b': 'boop',
* 'c': 'foo',
* 'd': 'bar'
* };
* var out = bifurcateOwn( obj, {}, predicate );
* // e.g., returns [ [ [ 'a', 'beep' ], [ 'b', 'boop' ], [ 'd', 'bar' ] ], [ [ 'c', 'foo' ] ] ]
*/
function bifurcateOwn( obj, opts, predicate ) {
var thisArg;
var bool;
var out;
var key;
var flg;
var v;
thisArg = opts.thisArg;
out = [ [], [] ];
flg = true;
for ( key in obj ) {
if ( hasOwnProp( obj, key ) ) {
flg = false;
v = obj[ key ];
bool = predicate.call( thisArg, v, key );
if ( bool ) {
out[ 0 ].push( [ key, v ] );
} else {
out[ 1 ].push( [ key, v ] );
}
}
}
if ( flg ) {
out.length = 0;
}
return out;
}
// EXPORTS //
module.exports = bifurcateOwn;
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