v147 · JavaScript · demo

Float Drift Lab

Generate a large array of floats and compare naive loop summation against Math.sumPrecise. Watch the error accumulate in the naive column.

Expected (rational) sum: —

Naive loop (+)

—
Error: —

Math.sumPrecise()

—
Error: —
// Naive summation
function naiveSum(values) {
  let total = 0;
  for (const v of values) total += v;
  return total;
}

// Precise summation (Chrome 147+)
const precise = Math.sumPrecise(values);

// Error = |result - expected|

see also

implementation reference

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