Trace the Accumulator
Trace the Accumulator
reduce is easier to reason about when you track the accumulator after each callback. The value returned from one callback call becomes the accumulator passed into the next call.
Study this code before editing the answers:
const finalTotal = [3, -1, 4].reduce((total, change) => {
return total + change;
}, 10);Your task: Trace the accumulator. Assign the accumulator value after the first callback to afterFirst, after the second callback to afterSecond, and the final reduced value to finalTotalPrediction.
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Trace the Accumulator
reduce is easier to reason about when you track the accumulator after each callback. The value returned from one callback call becomes the accumulator passed into the next call.
Study this code before editing the answers:
const finalTotal = [3, -1, 4].reduce((total, change) => {
return total + change;
}, 10);Your task: Trace the accumulator. Assign the accumulator value after the first callback to afterFirst, after the second callback to afterSecond, and the final reduced value to finalTotalPrediction.