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sortedIndex javascript Code Snippet in 2023

arraymathintermediate

Last Updated: 30 January 2023

Finds the lowest index at which a value should be inserted into an array in order to maintain its sorting order.

  • Loosely check if the array is sorted in descending order.
  • Use Array.prototype.findIndex() to find the appropriate index where the element should be inserted.
const sortedIndex = (arr, n) => { const isDescending = arr[0] > arr[arr.length - 1]; const index = arr.findIndex(el => (isDescending ? n >= el : n <= el)); return index === -1 ? arr.length : index; };
sortedIndex([5, 3, 2, 1], 4); // 1 sortedIndex([30, 50], 40); // 1

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