How to re-use a calculated value in d3.js?

@darrion.kuhn 

In d3.js, you can re-use a calculated value by storing it in a variable and then referencing that variable multiple times in your code. Here is an example of how you can do this:

1. Calculate the value and store it in a variable:

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var calculatedValue = 100; // for example, calculate this value using your data and scales

1. Re-use the calculated value in your code:

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// Use the calculated value in an attribute
d3.selectAll("circle")
    .attr("r", calculatedValue);

// Use the calculated value in a function
function updateData() {
    var newData = [calculatedValue, calculatedValue * 2, calculatedValue * 3];
    // Update the data based on the calculated value
}

By storing the calculated value in a variable, you can easily reference it multiple times in your code and avoid having to recalculate it each time. This can help improve performance and make your code more efficient.