/**

* @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 isComplexLike = require( '@stdlib/assert-is-complex-like' );

var real = require( '@stdlib/complex-float64-real' );

var imag = require( '@stdlib/complex-float64-imag' );

// MAIN //

/**

* Returns a strided array of real and imaginary components.

*

* @private

* @param {Float64Array} buf - output array

* @param {Array} arr - array containing complex numbers

* @returns {(Float64Array|null)} output array or null

*/

function fromArray( buf, arr ) {

var len;

var v;

var i;

var j;

len = arr.length;

j = 0;

for ( i = 0; i < len; i++ ) {

v = arr[ i ];

if ( !isComplexLike( v ) ) {

return null;

}

buf[ j ] = real( v );

buf[ j+1 ] = imag( v );

j += 2; // stride

}

return buf;

}

// EXPORTS //

module.exports = fromArray;