JavaScript: Find the smallest prime number strictly greater than a given number
JavaScript Basic: Exercise-129 with Solution
Write a JavaScript program to find the smallest prime number strictly greater than a given number.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Find the smallest prime number strictly greater than a given number</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function next_Prime_num(num) {
for (var i = num + 1;; i++) {
var isPrime = true;
for (var d = 2; d * d <= i; d++) {
if (i % d === 0) {
isPrime = false;
break;
}
}
if (isPrime) {
return i;
}
}
}
console.log(next_Prime_num(3));
console.log(next_Prime_num(17));
Sample Output:
5 19
Flowchart:
ES6 Version:
function next_Prime_num(num) {
for (let i = num + 1;; i++) {
let isPrime = true;
for (let d = 2; d * d <= i; d++) {
if (i % d === 0) {
isPrime = false;
break;
}
}
if (isPrime) {
return i;
}
}
}
console.log(next_Prime_num(3));
console.log(next_Prime_num(17));
Live Demo:
See the Pen javascript-basic-exercise-129 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript program to find the smallest round number that is not less than a given value.
Next: Write a JavaScript program to find the number of even digits in a given integer.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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