block by ckuijjer 6675032

United States Postage Rate

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An implementation in D3 of Figure 4-42 “Step chart showing change in postage rate” in “Visualize This” by Nathan Yau.

Both the tickFormat function used for the x axis and the function used to render the amounts use a directly executed JavaScript function. This function returns another JavaScript function and creates a closure on the first variable, allowing them to have a specific format for the first option in the dataset.