let array = [3, 2, 11, 7, 6, 4, 10, 8, 15];
d3.min =>
d3.max =>
d3.extent =>
d3.sum =>
d3.median =>
d3.mean =>
array.sort(d3.ascending) =>
array.sort(d3.descending) =>
d3.quantile(array.sort(d3.ascending), 0.25) =>