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2023-03-02
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export default function extent(values, valueof) {
let min;
let max;
if (valueof === undefined) {
for (const value of values) {
if (value != null) {
if (min === undefined) {
if (value >= value) min = max = value;
} else {
if (min > value) min = value;
if (max < value) max = value;
}
}
}
} else {
let index = -1;
for (let value of values) {
if ((value = valueof(value, ++index, values)) != null) {
if (min === undefined) {
if (value >= value) min = max = value;
} else {
if (min > value) min = value;
if (max < value) max = value;
}
}
}
}
return [min, max];
}