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JavaScript reduce was called on an empty array without an initial value

TypeError: Reduce of empty array with no initial value

JavaScript could not reduce an empty array because no initial accumulator value was provided.

TypeError: Reduce of empty array with no initial valueruntime

Observed message

TypeError: Reduce of empty array with no initial value

Why it happens

  • Array.prototype.reduce is called on an empty array without an initial accumulator.
  • Filtering or preprocessing unexpectedly produced an empty array.
  • Code assumes at least one element is always present.

How to fix it

  1. Pass an explicit initial value to reduce().
  2. Handle empty arrays before calling reduce().
  3. Check upstream filtering or data loading that may produce no items.

Official reference

MDN: TypeError: Reduce of empty array with no initial value

Related errors

ReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variableTypeError: class constructors must be invoked with 'new'JavaScript class constructor was called without newRangeError: x can't be converted to BigInt because it isn't an integerJavaScript could not convert a non-integer value to BigInt

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