Check a Number is Prime or Not using Javascript | How to Find Prime Numbers in JS

Check a number is prime or not using javascript. How to find prime numbers in js? A prime number is a whole number greater than 1 that cannot be exactly divided by any whole number other than itself and 1 for example 2, 3, 5, 7, 11 and so on. Prime numbers are very useful in cryptography. So Write a function that checks if a number is prime in JavaScript? It is a common javascript interview question.

Define a function called "isPrime" that takes a single parameter "num". First check if the passed in number is less than or equal to 1. If it is, return false. This is because a number less than or equal to 1 cannot be a prime number. Then you can use a for loop to iterate through all the numbers from 2 to the passed in number, using the variable "i" to represent the current number.

For each iteration of the loop, check if the passed in number is divisible by the current value of "i"
using the modulo operator (%). If number is divisible by i, meaning the remainder is 0, the function returns false, since a prime number is only divisible by 1 and itself. If the loop completes without finding a divisor, the function should returns true, indicating that the passed in number is a prime number. Call the function with a value as the parameter, and function will return true, if passed number is a prime number.

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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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This tutorial also covers following topics:
1- Check Number is Prime or Not in Javascript
2- check if number is prime javascript
3- how to get prime numbers in javascript
4- check prime number in javascript
5- prime numbers in js
6- check if number is prime

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[raven.]

Thx goodness I found smth like this explained in normal English, you're a lifesaver!

[craigtipple]

if (num % i === 0)

What if num = 2?

It can be divided by itself and would leave nothing remaining. This would return false, but 2 is a prime number.... so that's confusing me!