20 lines
566 B
Markdown
20 lines
566 B
Markdown
### sortedIndex
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Returns the lowest index at which value should be inserted into array in order to maintain its sort order.
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Check if the array is sorted in descending order (loosely).
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Use `Array.findIndex()` to find the appropriate index where the element should be inserted.
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```js
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const sortedIndex = (arr, n) => {
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const isDescending = arr[0] > arr[arr.length - 1];
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const index = arr.findIndex(el => isDescending ? n >= el : n <= el);
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return index === -1 ? arr.length : index;
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};
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```
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```js
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sortedIndex([5,3,2,1], 4); //1
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sortedIndex([30,50],40); // 1
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```
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