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A basic solution to challenge sum-all-primes (#34249)

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OLOGUNOWA Samuel
2019-03-04 11:36:05 +01:00
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35
guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes/index.md
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@ -35,7 +35,7 @@ This problem is hard if you have to create your own code to check for primes, so
**Solution ahead!**
## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution 1:
function sumPrimes(num) {
var res = 0;
@ -86,6 +86,39 @@ This problem is hard if you have to create your own code to check for primes, so
* <a href='https://forum.freecodecamp.com/t/javascript-for-loop/14666s-Explained' target='_blank' rel='nofollow'>JS For Loops Explained</a>
## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution 2:
function sumPrimes(num) {
let i = 1;
let sum = 0;
while(i <= num){
if(isPrime(i)){
sum += i;
}
i++;
}
return sum;
}
//function to check if a number is prime or not
function isPrime(x){
for(let i =2;i < x;i++){
if(x % i === 0) return false;
}
return x !==1 && x !== 0;
}
//test here
sumPrimes(10);
![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLnZ/0' target='_blank' rel='nofollow'>Run Code</a>
### Code Explanation:
* Create a function to check if a number is prime or not.
* Declare two variables. One to keep us within the limit of the given number and the other to store the sum of numbers to be returned.
* Create a loop to check all numbers lesser than or equal to the given number.
* Check if a number is prime and add it to the value of sum.
* Return the value of sum once the loop exits.
## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
function sumPrimes(num) {