如何使用 d3js 设置比例？

Question

I'm trying to build a bar chart but keep getting this error:

SyntaxError: missing ) after argument list

It says the problem is in the line of the.range() method but I don't see it. Everything looks fine to me.

I downloaded the dataset from here: https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/GDP-data.json

 let url = "data.json"; var svg = d3.select('body').append('svg').attr('width', 900).attr('height', 460); var yScale; var arr = []; d3.json(url).then(function(data) { for (let i = 0; i < data.data.length; i++) arr[i] = data.data[i]; }).then(() => yScale = d3.scaleLinear().domain([0, d3.max(arr, (d) => d[1])]).range([460, 0]); svg.selectAll('rect').data(arr).enter().append('rect').attr('fill', 'blue').attr('height', d => d[1]).attr('width', 3).attr('x', (d, i) => 4 * i).attr('y', (d, i) => yScale(d[1])) );

 <script src="https://d3js.org/d3.v6.min.js"></script>

Answer 1

With multiple lines of code, your arrow function needs curly braces

d3.json(url).then(function(data) {
    for (let i = 0; i < data.data.length; i++) arr[i] = data.data[i];
    }).then(() => {

      yScale = d3.scaleLinear()
                 .domain([0, d3.max(arr, (d) => d[1])])
                 .range([460, 0]);

    svg.selectAll('rect')
    .data(arr)
    .enter()
    .append('rect')
    .attr('fill', 'blue')
    .attr('height', d => d[1])
    .attr('width', 3)
    .attr('x', (d, i) => 4 * i)
    .attr('y', (d, i) => yScale(d[1]))

   });