如何将字符串转换为可读流？ [英] How do I turn a String into a Readable Stream?

问题描述

我正在尝试将字符串流传输到另一个流：

I'm trying to stream a string to another stream:

streamer = new stream.Transform objectMode: true
stringer = (string) ->
    streamer._transform = (chunk, encoding, done) ->
        @push string.split('').shift()
        done()

    return streamer

streamer.on 'readable', ->
    console.log 'readable'

stringer('hello').pipe process.stdout

但是没有任何内容登录控制台。我在做什么错了？

But nothing logs in the console. What am I doing wrong?

推荐答案

您所需要的就像是说自己是可读流而不是转换流。此外，您还有一个错误，因为 string.split（''）总是返回相同的数组，然后返回 .shift（）将始终返回相同的字母。您的代码一旦重写如下：

What you need as you say yourself is a readable stream not a transformation stream. Additionally you have a bug because string.split('') always return the same Array and then .shift() will always return the same letter. Your code once rewritten is as follows:

'use strict'

Readable = require('stream').Readable

stringer = (string) ->
  array = string.split('')
  new Readable
    read: (size) ->
      @push array.shift()
      return

readable = stringer('hello')

readable.on 'readable', ->
  console.log 'readable'
  return

readable.pipe process.stdout

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