Learn D3.js

Array utilities

We chose 100 as the upper limit in our scale domain because it's larger than any of the distances in the data, but the choice was rather arbitrary. We could have chosen the largest value in the array. If you have hundreds of lines of data, you can use JavaScript array functions (see Chapter 1, Introduction) to find out the maximum value.

D3 also includes a collection of array manipulation functions that extend JavaScript's native functions. Some look similar but may be more efficient for data manipulation (for example, by ignoring null, NaN, and undefined values). In order to use them, you need the d3-array module (which is also part of the default bundle).

Here, we changed the configuration of our barScale() function so ...