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Prime numbers within a range in JavaScript
We are required to write a JavaScript function that takes in two numbers, say, a and b and returns the total number of prime numbers between a and b (including a and b, if they are prime).
For example: If a = 21, and b = 38.
The prime numbers between them are 23, 29, 31, 37
And their count is 4
Our function should return 4
Example
The code for this will be −
const isPrime = num => {
let count = 2;
while(count < (num / 2)+1){
if(num % count !== 0){
count++;
continue;
};
return false;
};
return true;
};
const primeBetween = (a, b) => {
let count = 0;
for(let i = Math.min(a, b); i <= Math.max(a, b); i++){
if(isPrime(i)){
count++;
};
};
return count;
};
console.log(primeBetween(21, 38));Output
The output in the console −
4
Updated on: 15-Oct-2020
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