Array : Javascript: How to find first duplicate value and return its index?

Array : Javascript: How to find first duplicate value and return its index?

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codeExplained: Find the First Duplicate
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codeExplained: Find the First Duplicate

codeExplained: Find the First Duplicate
How to REMOVE DUPLICATES from an array in JavaScript? (4 ways in under 9 mins!) #javascriptinterview

How to REMOVE DUPLICATES from an array in JavaScript? (4 ways in under 9 mins!) #javascriptinterview
indexOf and lastIndexOf Array Methods | JavaScript Tutorial

indexOf and lastIndexOf Array Methods | JavaScript Tutorial
Find first duplicate element in an array.

Find first duplicate element in an array.
Find unique value from an array JavaScript

Find unique value from an array JavaScript
JavaScript Get Unique Values From Array

JavaScript Get Unique Values From Array
Find Index Of Array Element JAVASCRIPT INTERVIEW QUESTIONS

Find Index Of Array Element JAVASCRIPT INTERVIEW QUESTIONS
Find element index in array with JavaScript

Find element index in array with JavaScript
JavaScript Array indexOf method

JavaScript Array indexOf method
Return the indexes of NaN in Array | JavaScript Interview Question

Return the indexes of NaN in Array | JavaScript Interview Question
Array : How to search for multiple index(es) of same values in javascript array

Array : How to search for multiple index(es) of same values in javascript array
Find the first repeating element in an array of integers | GeeksforGeeks

Find the first repeating element in an array of integers | GeeksforGeeks
Array: Find First Element Index

Array: Find First Element Index
Find Duplicate Numbers from Array with O(n) Time Complexity || Easy Way

Find Duplicate Numbers from Array with O(n) Time Complexity || Easy Way
Javascript - Create a function that returns the index of the first vowel in a string

Javascript - Create a function that returns the index of the first vowel in a string