JavaScript Coding Questions50. search element right before target with Binary Search(possible duplicate array)
50. search element right before target with Binary Search(possible duplicate array)
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easy - accepted / - tried
This is a variation of 37. implement Binary Search (unique).
Your are given a sorted ascending array of number, but might have duplicates, you are asked to return the element right before first appearance of a target number.
If not found return undefined
.
note
Please don't use Array.prototype.indexOf()
, it is not our goal.