JS Built-ins
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GlobalFunctionsisFiniteintermediate

isFinite — numeric string coerces

📖 Usage Example
isFinite('42')      // → true  (coerced to 42)
isFinite('hello')   // → false (coerced to NaN)

The global isFinite() coerces its argument to a number first — prefer Number.isFinite() to avoid coercion.

isFinite Coercion

isFinite('42') coerces '42' to 42 and returns true.

Challenge: Verify the coercion.

💡 Hints (1)
  • • The global isFinite coerces its argument to a number first.