Where does the lambda get its parameter

Tell us what’s happening:

On this lesson:

I’m just not understanding how this:

    const xScale = d3.scaleLinear()
                     .domain([0, d3.max(dataset, (d) => d[0])])
                     .range([padding, w - padding]);

can be used like this:

.attr("cx", (d) => xScale(d[0]))

I can see where the information is flowing through, but I can’t understand what makes it connect.

How does it know to pass d into d3.max when its called like xScale(d[0])?

It’s not the variable name is it, that could be anything, but how does it map?

Where can I learn what’s happening here?

  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36.

Challenge: Use a Pre-Defined Scale to Place Elements

Link to the challenge:

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.