deep-extend-stream


Recursively extend the object in a stream

``javascript
const deepExtend = require('deep-extend-stream');

const target = {foo: {bar: 123}};
const deepExtendStream = deepExtend(target);

deepExtendStream.write({foo: {baz: 'Hello'}});
deepExtendStream.write({qux: 'World'});

deepExtendStream.on('finish', () => {
target; //=> {foo: {bar: 123, baz: 'Hello'}, qux: 'World'}
});

deepExtendStream.end();
`

Installation

Use npm.

`
npm install deep-extend-stream
`

API

`javascript
const deepExtend = require('deep-extend-stream');
`

$3

target: Object or Array
callback: Function
Return: Object (stream.Transform)

It returns a transform stream that recursively extends the target object with passed objects (what is called "deep extend").

Target object is optional ({} by default).

`javascript
const deepExtend = require('deep-extend-stream');
const deepExtendStream = deepExtend();

deepExtendStream
.on('finish', function() {
// this._target is an internal property to keep target object
this._target;
/*=> {
'0': 'a',
'1': {
b: 'c',
d: 'e'
},
'2': 'f'
} */
})
.write(['a', {'b': 'c'}, 'f'])
.write({'1': {'d': 'e'}})
.end();
`

#### callback(target)

You can specify a function to be called on finish event. It will be called with the target object as its first argument.

`javascript
const deepExtend = require('deep-extend-stream');

deepExtend(target => {
target; //=> [0, 1, 2]
}).end([0, 1, 2]);

deepExtend([0, 1, 2], target => {
target; //=> [0, 1, 2]
}).end();
``

License

Copyright (c) 2014 - 2017 Shinnosuke Watanabe

Licensed under the MIT License.