How can i write an array of arrays in a csv file?

Asked Jan 31 '22 at 20:30

Active Jan 31 '22 at 20:36

Viewed 67 times

I have an array of arrays like this [[1,2,3],[4,5,6],[7,8,9]]

i think the code will be like this:

const arrayToCSV = (table, delimiter = ',') =>
table.map(v => v.map(x => `"${x}"`).join(delimiter)).join('\n');

but something left to write with nodejs, how can i write those arrays in a file csv?

edited Jan 31 '22 at 20:36

asked Jan 31 '22 at 20:30

logger

Does this answer your question? [How to export JavaScript array info to csv (on client side)?](https://stackoverflow.com/questions/14964035/how-to-export-javascript-array-info-to-csv-on-client-side) – Simon K Jan 31 '22 at 20:33
No need for 2 maps `[[1,2,3],[4,5,6],[7,8,9]].map(arr => arr.join(",")).join("\n")` – epascarello Jan 31 '22 at 20:35
just reduce `[[1,2,3],[4,5,6],[7,8,9]].reduce((s, arr) => s += \`${arr.join(",")}\n\`, '');` – epascarello Jan 31 '22 at 20:38
@epascarello ok but now what library can i use to write in a csv file? – logger Jan 31 '22 at 20:40
Why do you need a library to write to a file? – epascarello Jan 31 '22 at 20:45
@epascarello no, i just want to write with or without a library – logger Jan 31 '22 at 20:47
so use fs and write the file. Or use any one of the npm modules in node that do it for CSV. "Node save CSV" should have plenty of example out there. – epascarello Jan 31 '22 at 20:50

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