Run results for: Sanitize - MeasureThat.net

Test name	Executions per second
✓ From preact sources	26,838 Ops/sec
Simple solution	21,322 Ops/sec
ChatGPT solution	5,816 Ops/sec

From preact sources

const strings = [
  'dsafsdafasdf',
  '>asdf<span>sdfsdf',
  'sdfdsf&sdf"sdfadsfs\'sadf\nsadfasdf',
  '',
  '123#<!-- sdfsdf -->',
]


const ENCODED_ENTITIES = /["&<]/

function encodeEntities(str) {
  // Skip all work for strings with no entities needing encoding:
  if (str.length === 0 || ENCODED_ENTITIES.test(str) === false) return str

  let last = 0,
    i = 0,
    out = '',
    ch = ''

  // Seek forward in str until the next entity char:
  for (; i < str.length; i++) {
    switch (str.charCodeAt(i)) {
      case 34:
        ch = '&quot;'
        break
      case 38:
        ch = '&amp;'
        break
      case 60:
        ch = '&lt;'
        break
      default:
        continue
    }
    // Append skipped/buffered characters and the encoded entity:
    if (i !== last) out = out + str.slice(last, i)
    out = out + ch
    // Start the next seek/buffer after the entity's offset:
    last = i + 1
  }
  if (i !== last) out = out + str.slice(last, i)
  return out
}

for (let i = 0; i < 100; i++) {
  strings.map(encodeEntities)
}

Simple solution

const strings = [
  'dsafsdafasdf',
  '>asdf<span>sdfsdf',
  'sdfdsf&sdf"sdfadsfs\'sadf\nsadfasdf',
  '',
  '123#<!-- sdfsdf -->',
]

const sanitizeMap = {
  '<': '&lt;',
  '>': '&gt;',
  '"': '&quot;',
}

const sanitize = value => {
  if (value === undefined || value == null) {
    return null
  }
  return String(value).replace(/[<>"]/g, char => sanitizeMap[char])
}

for (let i = 0; i < 100; i++) {
  strings.map(sanitize)
}

ChatGPT solution

const strings = [
  'dsafsdafasdf',
  '>asdf<span>sdfsdf',
  'sdfdsf&sdf"sdfadsfs\'sadf\nsadfasdf',
  '',
  '123#<!-- sdfsdf -->',
]

function sanitizeChatGPT(value) {
  if (!value) return ''
  return value
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;')
}


for (let i = 0; i < 100; i++) {
  strings.map(sanitizeChatGPT)
}