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export default function reduce(values, reducer, value) {
if (typeof reducer !== "function") throw new TypeError("reducer is not a function");
const iterator = values[Symbol.iterator]();
let done, next, index = -1;
if (arguments.length < 3) {
({done, value} = iterator.next());
if (done) return;
++index;
}
while (({done, value: next} = iterator.next()), !done) {
value = reducer(value, next, ++index, values);
}
return value;
}