Reverse a number in JavaScript

Our aim is to write a JavaScript function that takes in a number and returns its reversed number

For example, reverse of 678 −

876

Here’s the code to reverse a number in JavaScript −

Example

const num = 124323;
const reverse = (num) => parseInt(String(num)
.split("")
.reverse()
.join(""), 10);
console.log(reverse(num));

Output

Output in the console will be −

323421

Explanation

• Let’s say num = 123
• We convert the num to string → num becomes ‘123’
• We split ‘123’ → it becomes [‘1’, ‘2’, ‘3’]
• We reverse the array → it becomes [‘3’, ‘2’, ‘1’]
• We join the array to form a string → it becomes ‘321’
• Lastly we parse the string into a Int and returns it → 321

AmitDiwan

Updated on: 18-Aug-2020

6K+ Views

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