javascript - 遍历 csv

Question

我正在尝试解析 csv:

col1,col2,col3
a,b,1
d,e,2

当我运行以下代码时

var fs = require("fs");
var d3 = require("d3");

fs.readFile("test.csv", "utf8", function(error, data) {
        var data = JSON.stringify(d3.csvParse(data));
        data.map((item, i) => console.log(`Hello ${item.col1} this ${item.col2} there are ${item.col3} blabla`));
});

我收到 TypeError: data.map is not a function

虽然以下运行正常。

var data = [{ "col1":"a","col2":"b","col3":1},
            { "col1":"d","col2":"e","col3":2}]

data.map((item, i) => console.log(`Hello ${item.col1} this ${item.col2} there are ${item.col3} blabla`));

Answer 1

d3.csvParse 返回一个数组，但您可以在此处将其转换为字符串:

var data = JSON.stringify(d3.csvParse(data));

当然，字符串没有.map。您可能想迭代数组:

const newData = d3.csvParse(data);
newData.forEach((item, i) => console.log(`Hello ${item.col1} this ${item.col2} there are ${item.col3} blabla`));

(不要使用 .map 因为您没有将其转换为新数组，至少在您发布的代码中没有)