d3.ascending(a, b)
Returns -1 if a is less than b, or 1 if a is greater than b, or 0. This is the comparator function for natural order, and can be used in conjunction with the built-in array.sort method to arrange elements in ascending order. It is implemented as:
function ascending(a, b) { return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN; }
Note that if no comparator function is specified to the built-in sort method, the default order is lexicographic (alphabetical), not natural! This can lead to surprising behavior when sorting an array of numbers.
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