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The reduce Method - Arrays | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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The reduce Method

Accumulating values

Reduce an array to a single value:

let numbers = [1, 2, 3, 4]

let sum = numbers.reduce((acc, n) => acc + n, 0)
console.log(sum)  // 10

let product = numbers.reduce((acc, n) => acc * n, 1)
console.log(product)  // 24

The callback receives an accumulator and current element. The second argument ( $0$ or $1$ above) is the initial accumulator value.