CODEWITHSUNDEEP
javascriptnode.js
ulrich
ulrich

Reputation: 3587

Iterating through csv

I am trying to parse a csv:

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

when I run the following code

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`));
});

I get TypeError: data.map is not a function

While the following is running fine.

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`));

Upvotes: 2

Views: 3770

Answers (1)

CertainPerformance
CertainPerformance

Reputation: 370699

d3.csvParse returns an array, but you convert it to a string here:

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

Strings don't have .map, of course. You probably want to iterate over the array:

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

(don't use .map because you aren't transforming it into a new array, at least not in the code you've posted)

Upvotes: 1

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