Understanding d3 domain and range values

README.md

Mapping domain values to range outputs with d3.

d3.scale.threshold()
   .domain([
      10,
      20,
      30,
      40
    ])
    .range([
      'red',  // applies to values < 10
      'blue', // 10-19
      'green', // 20-29
      'yellow', // 30-39<
      'orange'  // 40+
    ]);

Insight by @awoodruff

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