Concat.md

Concat

• class Concat
  • constructor()
  • _concat()

class Concat

import Concat from 'ex-stream/Concat';

Concatenate stream data by _concat function

import Concat from 'ex-stream/Concat';
import { log } from 'ex-stream/LogStream';

class ConcatArray extends Concat {
 constructor(options) {
   super({init: [], options});
 }
 _concat(result, chunk, enc) {
   return result.concat([chunk]);
 }
}

const concatArray = new ConcatArray();
concatArray.pipe(log()); // [1,2,3,4,5]
concatArray.write(1);
concatArray.write(2);
concatArray.write(3);
concatArray.write(4);
concatArray.end(5);

class ConcatString extends Concat {
 constructor(options) {
   super({init: '', options});
 }
 _concat(result, chunk, enc) {
   return result + chunk;
 }
}

const concatString = new ConcatString();
concatString.pipe(log()); // 'abcde'
concatString.write('a');
concatString.write('b');
concatString.write('c');
concatString.write('d');
concatString.end('e');

Constructor

Parameters:

• options: Object - Stream options

Class is abstract

---

Methods

_concat(result: *, data: *, enc: String)

Stream data concatenation method

Parameters:

• result: * - result of concatenation
• data: * - data for concatenation
• enc: String - data encoding for concatenation

Returns: * - result of concatenation