Array.prototype._reduce = function (callback, initial) {
if (initial) { previous = initial; for (let i = 0; i < this.length; ++ i) { previous = callback(previous, this[i], i, this) } } else { previous = this[0] for (let i = 1; i < this.length; ++ i) { previous = callback(previous, this[1], i, this) } } return previous
}
in else part it should be this[i+1] not this[1]
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Array.prototype._reduce = function (callback, initial) {
}
in else part it should be this[i+1] not this[1]