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Discussion on: Daily Challenge #292 - ISBN-10 Identifiers

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Sooraj (PS) • • Edited 
const validISBN10 = (num) => { 
  if (!/[0-9]{9}[X0-9]{1}/.test(num)) return false;
  return (num.split('').map((d, i) => d === 'X' ? (10 * (i + 1)) : (d * (i + 1))).reduce((a, b) => a + b) % 11 === 0)
}