42 lines
896 B
JavaScript
42 lines
896 B
JavaScript
'use strict'
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const stream = require('stream')
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const numbers = new Array(1000).join(',').split(',').map((v, k) => k)
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let acc = ''
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const strings = numbers.map(n => acc += n)
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const bufs = strings.map(s => new Buffer(s))
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const objs = strings.map(s => ({ str: s }))
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module.exports = class Numbers {
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constructor (opt) {
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this.objectMode = opt.objectMode
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this.encoding = opt.encoding
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this.ii = 0
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this.done = false
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}
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pipe (dest) {
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this.dest = dest
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this.go()
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return dest
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}
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go () {
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let flowing = true
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while (flowing) {
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if (this.ii >= 1000) {
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this.dest.end()
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this.done = true
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flowing = false
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} else {
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flowing = this.dest.write(
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(this.objectMode ? objs
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: this.encoding ? strings
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: bufs)[this.ii++])
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}
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}
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if (!this.done)
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this.dest.once('drain', _ => this.go())
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}
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}
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