listing-6.8.js

//
// This example imports a CSV file, filters out an entire column and exports a new CSV file.
//
// This example uses Data-Forge.
//

"use strict";

const dataForge = require('data-forge');

const inputFileName = "./data/surveys.csv";
const outputFileName = "./output/surveys-with-no-reef_type-using-data-forge.csv";

function transformData (inputDataFrame) {
    return inputDataFrame.dropSeries("reef_type");
}

dataForge.readFile(inputFileName)
    .parseCSV()
    .then(inputDataFrame => {
        const outputDataFrame = transformData(inputDataFrame);

        return outputDataFrame
            .asCSV()
            .writeFile(outputFileName);
    })
    .then(() => {
        console.log("Done!");
    })
    .catch(err => {
        console.error("Error!");
        console.error(err && err.stack || err);
    });