How to Find Missing Elements in Array | Find Missing Element in Array of Integers using JavaScript

How to find missing elements in array? Find missing element in array of integers using javascript. Write a function that finds the missing element or elements in an array of integers in JavaScript. We can use a Set to store the elements of the given array, iterate through the range of numbers to check if each number is present in the set. If a number is not found in the set, it is returned as the missing element.

To do that define a function called "findMissingElement" that takes in an array as a parameter. Create a new instance of the Set object, which is a built-in JavaScript object that can store unique values of any type.

Iterate over the input array and use the "add" method of the Set object to add each element of the array to the set. Then iterate over a range of numbers from 1 to the length of the input array plus 1, and for each number,
check if the set contains the number using the "has" method of the Set object. If the set does not contain the current number, return that number as the missing element.

Call the function and give it array containing numbers. It will return the missing element in the array.

Now this was to find a single missing element or first missing element from array. We can also find all missing elements from a given range of numbers in an array.

Let's define a function called "findMissingElements" that takes in an array as a parameter. Declare a variable "count" initialized to zero. Iterate over a range of numbers starting from the first element of the input array to the last element of the input array.

For each number, compare the current number with the element at the index "count" of the input array. If the current number is equal to the element at the index "count" of the input array, increment the value of count.

If not, display the current number as a missing element in the input array. Call the function and use array as argument which displays the missing elements in the array.

And this is how we can find the missing element or elements in an array of integers in JavaScript.

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