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danfo. convertFunctionTotransformer

Converts a function to a pipe transformer. Only available in Nodejs version.

danfo.convertFunctionTotransformer(func)

Parameters
Type
Description
Default

func

Function

A valid JavaScript function to convert to a pipe transformer.

Returns:

return A pipe transformer that applies the function to each row of object.

The convertFunctionTotransformer takes a function and converts it to a Nodejs stream transformer function which can be used in combination with streamCsvTransformer to incrementally transform large files.

Converting a function to a transformer

const dfd = require("danfojs-node")

/*
 * A simple function that takes each row of a DataFrame and splits the
 * name field. 
*/
const renamer = (dfRow: DataFrame) => {
    const dfModified = dfRow["Names"].map((name) => name.split(",")[0])
    return dfModified
}

const transformer = dfd.convertFunctionTotransformer(renamer)
console.log(transformer)
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <!--danfojs CDN -->
    <script src="https://cdn.jsdelivr.net/gh/opensource9ja/danfojs@latest/lib/bundle.js"></script>
    <title>Document</title>
</head>

<body>

    <script>

        let data = new dfd.date_range({"start":'1/1/2018',period:5, freq:'M'})
        console.log(data);
         
    </script>
</body>

</html>
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