24 lines
811 B
Markdown
24 lines
811 B
Markdown
---
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title: arrayToCSV
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tags: array,string,intermediate
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---
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Converts a 2D array to a comma-separated values (CSV) string.
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Use `Array.prototype.map()` and `Array.prototype.join(delimiter)` to combine individual 1D arrays (rows) into strings.
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Use `Array.prototype.join('\n')` to combine all rows into a CSV string, separating each row with a newline.
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Omit the second argument, `delimiter`, to use a default delimiter of `,`.
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```js
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const arrayToCSV = (arr, delimiter = ',') =>
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arr
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.map(v => v.map(x => (isNaN(x) ? `"${x.replace(/"/g, '""')}"` : x)).join(delimiter))
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.join('\n');
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```
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```js
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arrayToCSV([['a', 'b'], ['c', 'd']]); // '"a","b"\n"c","d"'
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arrayToCSV([['a', 'b'], ['c', 'd']], ';'); // '"a";"b"\n"c";"d"'
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arrayToCSV([['a', '"b" great'], ['c', 3.1415]]); // '"a","""b"" great"\n"c",3.1415'
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```
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