Data Visualization with D3 - Dynamically Set the Coordinates for Each Bar

JavaScript
1

Tell us what’s happening:
Test was passed successfully (with answer: return i30;) .
However, when answer is altered to: return i30 + “px”; the test is not passing DESPITE the output bars being correctly placed in the svg element.

Your code so far

<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];

    const w = 500;
    const h = 100;

    const svg = d3.select("body")
                  .append("svg")
                  .attr("width", w)
                  .attr("height", h);

    svg.selectAll("rect")
       .data(dataset)
       .enter()
       .append("rect")
       .attr("x", (d, i) => {
         // Add your code below this line
          return i*30 + "px";
         // Add your code above this line
       })
       .attr("y", 0)
       .attr("width", 25)
       .attr("height", 100);
  </script>
</body>

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Challenge: Data Visualization with D3 - Dynamically Set the Coordinates for Each Bar

Link to the challenge:

2

Remove the px so you can pass the test.

1 Like
3

Test is passed exactly like that.
My question is: is adding ‘px’ a logical error that I should avoid (output is correct). If not, and this is some issue with answer checking mechanism, then its fine. Mainly, I want to correct myself if this is some logical error!
Thanks

4

Look at the other .attr(...) calls that are setting y, height, and width without the px. SVG units are arbitrary (else it’s not scalable…).

5

Thanks. My query fully resolved. And learned something important/