/r/shittyprogramming challenge: add a new line after the end of each sentence, the shittiest way possible

service.js

/* this is a paragraph parser service class */
class ParagraphParserService {
  constructor () {
    this.n = `
`
    this.line = `
`
  }

  addNewLineAfterSentence ({ paragraphOfText }) {
    let x = paragraphOfText.split(''),
      y = []
    x.forEach((a, i) => {
      if (a === ' ') {
        if (x[i - 1] === '.') {
          // update variable
          y = [...y, i]
          if (x[i + 1] === this.line) y.pop()
        }
        if (x[i - 1] === '?') {
          // update variable
          y = [...y, i]
          if (x[i + 1] === this.line) y.pop()
        }
      }
    })
    y = y.map((z, i) => {
      x = [...x.slice(0, z + i + 1), this.n, ...x.slice(z + i + 1, 99999999999)]
      return 'new line added'
    })
    if ([...new Set(y)].length !== 1 || [...new Set(y)][0] !== 'new line added')
      throw new Error('Failed to add new lines')

    x = x.join('')
    // return the result
    const result = x
    return result
  }
}

const sentence = 'This. is a text... test. \ntesting? text 7:00 p.m.'

console.log(
  new ParagraphParserService().addNewLineAfterSentence({
    paragraphOfText: sentence
  })
)