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30-seconds-of-code/snippets/sortedIndex.md
2017-12-31 16:53:40 +02:00

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### sortedIndex
Returns the lowest index at which value should be inserted into array in order to maintain its sort order.
```js
const sortedIndex = (arr,n) => {
let [anarray, isReversed] = arr[0] > arr[1] ? [arr.reverse(), true] : [arr, false];
let val = anarray.findIndex(el => n <= el);
return val === -1 ? arr.length : isReversed ? arr.length - val : val
}
```
```js
sortedIndex([5,3,2,1], 4); // 1
sortedIndex([30,50],40); // 1
```