Add arrayToCSV

snippets/arrayToCSV.md

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+### arrayToCSV
+
+Converts a 2D array to a comma-separated values (CSV) string.
+
+Use `Array.map()` and `String.join(delimiter)` to combine individual 1D arrays (rows) into strings.
+Use `String.join('\n')` to combine all rows into a CSV string, separating each row with a newline.
+Omit the second argument, `delimiter` to use a default delimiter of `,`.
+
+```js
+const arrayToCSV = (arr, delimiter = ',') => arr.map(v => v.join(delimiter)).join('\n');
+```
+
+```js
+arrayToCSV([['a','b'],['c','d']]); // 'a,b\nc,d'
+arrayToCSV([['a','b'],['c','d']], ';'); // 'a;b\nc;d'
+```