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Update join.md

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atomiks
2018-01-01 21:54:31 +11:00
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@ -3,11 +3,15 @@
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. 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.
```js ```js
const join = (arr = [],separator = ',',end = separator ) => { const join = (arr = [], separator = ',', end = separator) =>
return arr.reduce((acc,val,i) => { arr.reduce(
return i == arr.length - 2 ? acc + val + end : i == arr.length - 1 ? acc + val : acc + val + separator (acc, val, i) =>
},'') i == arr.length - 2
} ? acc + val + end
: i == arr.length - 1 ? acc + val : acc + val + separator,
''
);
``` ```
```js ```js