Discussion on: 20 JavaScript One-Liners That Will Help You Code Like a Pro

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15 and 16 doesn't work with multi character emojis

> truncateString('Hello 😀 How are you?', 10)
'Hello �...'

You could use Array.from first to convert the string into an array of strings each holding a single character

const truncateString = (string, length) => {
  const chars = Array.from(string)
  return chars.length < length ? string : `${chars.slice(0, length - 3).join('')}...`;
};

This will work correctly

> truncateString('Hello 😀 How are you?', 10)
'Hello 😀...'