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Update join.md

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Angelos Chalaris
2018-01-01 14:32:21 +02:00
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### join ### join
Is like `Array.join()` but with an additional argument of `end`(is equal to `separator` by default) which is used to separate the second to last and last items in the array. Returns `""` when the array is empty and the first item when the length of array is 1. Joins all elements of an array into a string and returns this string. Uses a separator and an end separator.
Use `Array.reduce()` to combine elements into a string.
Omit the second argument, `separator`, to use a default separator of `','`.
Omit the third argument, `end`, to use the same value as `separator` by default.
```js ```js
const join = (arr = [], separator = ',', end = separator) => const join = (arr, separator = ',', end = separator) =>
arr.reduce( arr.reduce(
(acc, val, i) => (acc, val, i) =>
i == arr.length - 2 i == arr.length - 2