Travis build: 27 [custom]

README.md

@@ -107,6 +107,7 @@ average(1, 2, 3);
 
 * [`all`](#all)
 * [`any`](#any)
+* [`arrayToCSV`](#arraytocsv)
 * [`bifurcate`](#bifurcate)
 * [`bifurcateBy`](#bifurcateby)
 * [`chunk`](#chunk)
@@ -849,6 +850,31 @@ any([0, 0, 1, 0]); // true
 <br>[⬆ Back to top](#table-of-contents)
 
 
+### 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');
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+arrayToCSV([['a', 'b'], ['c', 'd']]); // 'a,b\nc,d'
+arrayToCSV([['a', 'b'], ['c', 'd']], ';'); // 'a;b\nc;d'
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
 ### bifurcate
 
 Splits values into two groups. If an element in `filter` is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.