TypeError: Reduce of empty array with no initial value
Array.reduce() ran on an empty array without an initial value.
Exact message you may see
Reduce of empty array with no initial value
Seen on:
JavaScript
Meaning
Without an initial value reduce uses the first element as the accumulator — impossible on an empty array.
Common causes
- reduce on filtered results that are empty
- Missing initial value argument
⚡ Quick fix
- Always pass an initial value: arr.reduce((a, b) => a + b, 0)
- Check for empty arrays before reducing when no sensible default exists
Detailed fix by platform
JavaScript
const total = items.reduce((sum, i) => sum + i.price, 0);
How to diagnose
- Array — Can it be empty?
- Call — Initial value passed?
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Last updated 14 Oct 2026