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`;
document.write.../ [5 call] 16 4 4 [0, 1, 2, 3, 4] 20
reduceRight...()
// array.reduceRight(function (previousValue, currentValue, index, array) {}, initialValue...)
[0, 1, 2, 3, 4].reduceRight((previousValue, currentValue, index, array) => { return previousValue