How to Reverse an Int in JavaScript | Learn JavaScript & Algorithms

How to reverse an int in javascript? How to reverse an integer? Reversing an Int or Integer is a good algorithmic challenge to solve using JavaScript. Challenge is to create a function that takes an integer, and returns an integer that is the reverse ordering of numbers, even for the negative number. Reversing an Integer is different than reversing a string in javascript.

So how to reverse an integer and how to change the data type of the returned value to be a Number? To do that define a function named "reverseInt" that takes in a single parameter, "number".
It will reverse the digits of the input number and return the reversed number with the same sign as the input number.

Use the built-in JavaScript method toString on the input number to convert it to a string. This is necessary. For string we won't do that. For number it is a must. Then use the split method to split the string into an array of individual characters. The reverse method is then being called on the resulting array, which reverses the order of the elements. Use join method on the reversed array, which combines all the elements in the array back into a single string. This is string that will need converting back to number.

Call the function with the argument, which when passed to the function, returns reversed number.

- toString method is necessary. Removing toString gives a TypeError.
- parseInt is necessary because if we don't use it, we will get NaN or not a number with a negative number input.

reverse a number correctly.

And this is how we can reverse an Int using javascript.

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It can be a good javascript interview question or frontend interview question. You may not be required to solve it on paper or whiteboard but the interviewer may ask you to give an idea on how to approach this algorithm. If you have an understanding of how to solve this problem or approach this algorithm, you will be able to answer it and get your next job as a frontend developer or full-stack developer.

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