Check to see if our current index is prime, otherwise ignore it. The final stage is in fact the auto discounting of the even numbers. Set every index hit to false because it is no longer a prime number.

You can test it for yourself; console. If you think you have a better way to solve this problem or have been asked a question similar to this in an interview, please share your experiences in the comments as they may help potential job seekers.

Also this is ready for the web workers, multi-threading. I have also implemented the segmentation part of this algorithm to push to the workers. Take the square root of our desired value which will represent a limit to our looping. A prime number via Wikipedia is as follows: Think it this way.

This is the core algorithm.

Sieve of Sundaram is only fast if the loop indices start and end limits are correctly selected such that there shall be no or minimal redundant multiple elimination of the non-primes. Our code for this logic is as follows: So that we will be able to use multiple threads too.

Our website is made possible by displaying online advertisements to our visitors. Conclusion Determining if a number is prime or printing all prime numbers up to a limit is a common interview question.

I have decided to take this quest a little further. Sieve of Eratosthenes via Wikipedia: So one idea might be segmentation and to keep n small all the time.

A simple, ancient algorithm for finding all prime numbers up to any given limit. We are talking almost O n here. I have just made a test.

So what makes a number a prime number? We then loop from two all the way up until our number minus one because we know that our number will be divisible by itself and one.

It does so by iteratively marking as composite i. In most programming languages there is a modulus type function for determining the remainder of a division between two numbers. If the remainder of our value with the current loop value is zero then we know it is not prime so break out and say so.

Just like the Sieve of Erasthotenes, the Sieve of Sundaram algorithm also crosses out some selected integers from the list.Write a JavaScript function that accepts a number as a parameter and check the number is prime or not. Note: A prime number (or a prime) is a natural number greater than 1.

I'm doing making a program using the same concept to find prime numbers. The problem is that my program uses dynamic variables. This causes quite a few problems considering that I program javascript without a debugger and use my browser to compile it via HTML.

Prime Number Program in JavaScript. Using JavaScript you can easily write any programming code, Here we write one of the most popular program Prime Number Program in JavaScript.

To perform this task we need for loop and if else condition. JavaScript to print Prime Numbers! Posted on February 7, by agurchand. Hello friends, JavaScript – Find Prime number or not! JavaScript to find Odd or Even number!

Python program to find prime number or not! PHP Script to print Fibonacci series. Java program to display prime numbers from 1 to and 1 to n By Chaitanya Singh | Filed Under: Java Examples The number which is only divisible by itself and 1 is known as prime number.

Determine if a number is a prime number using a modulus or by making use of the Sieve of Eratosthenes algorithm. A common question solved with JavaScript.

DownloadWrite a program for prime number in javascript

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