 # 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>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Find the smallest prime number strictly greater than a given number</title>
<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.

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﻿

## JavaScript: Tips of the Day

Converts a string to title case

Example:

```const toTitleCase = str =>
str
.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
.map(x => x.charAt(0).toUpperCase() + x.slice(1))
.join(' ');
console.log(toTitleCase('some_database_field_name')); // 'Some Database Field Name'
console.log(toTitleCase('Some label that needs to be title-cased')); // 'Some Label That Needs To Be Title Cased'
console.log(toTitleCase('some-package-name')); // 'Some Package Name'
console.log(toTitleCase('some-mixed_string with spaces_underscores-and-hyphens')); // 'Some Mixed String With Spaces Underscores And Hyphens'
```

Output:

```"Some Database Field Name"
"Some Label That Needs To Be Title Cased"
"Some Package Name"
"Some Mixed String With Spaces Underscores And Hyphens"
```