Is it possible to retrieve the previous value of a given input from an array? If so, how can we achieve this?
var theArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15];
const findValue = (arr, input) => {
// To do
}
findValue(theArray, 15)
If we provide the input as 15, the expected output is 14.
To uncover the position of the given input within an array, and subsequently reveal the index preceding it:
var numArray = [1,2,3,4,5,6,7,8,9,14,15];
const findPreviousValue = (arr, target) => arr[arr.indexOf(target) - 1]
console.log(findPreviousValue(numArray , 15))
It's advisable to account for scenarios where the input falls at index 0...
function searchForPreviousValue(array, target) {
let previousIndex = array.findIndex(element => element === target) - 1;
return previousIndex < 0 ? null : array[previousIndex];
}
If there is no previous item in the array, this function will return null and it searches from left to right.
Assuming the value is one-of-a-kind, conveniently locate it within the array by employing a recognized search method such as binary search. Once found, retrieve the index that precedes this value (unless it happens to be the initial entry).
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