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All topics›JavaScript›Arrays & strings

String to Integer (atoi)

advancedlayer B2 · Arrays & strings5 tests

Write myAtoi(s), a hand-rolled string-to-number conversion following these rules exactly, in order.

  • Skip any leading spaces
  • Accept one optional + or -
  • Read digits until a non-digit or the end of the string; stop there and ignore the rest
  • If no digits were read, the answer is 0
  • Clamp the result to the signed 32-bit range: below -2147483648 becomes -2147483648, above 2147483647 becomes 2147483647
  • Do not use parseInt, Number or +s

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