 # JavaScript: Check whether a given string contains equal number of p's and t's

## JavaScript Basic: Exercise-55 with Solution

Write a JavaScript program to check whether a given string contains equal number of p's and t's.

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>check whether a given string contains equal number of p's and t's</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function equal_pt(str)
{
var str_p = str.replace(/[^p]/g, "");

var str_t = str.replace(/[^t]/g, "");

var p_num = str_p.length;
var s_num = str_t.length;

return p_num === s_num;

}
console.log(equal_pt("paatpss"));
console.log(equal_pt("paatps"));
```
```

Sample Output:

```false
false
```

Flowchart: ES6 Version:

``````function equal_pt(str)
{
const str_p = str.replace(/[^p]/g, "");

const str_t = str.replace(/[^t]/g, "");

const p_num = str_p.length;
const s_num = str_t.length;

return p_num === s_num;

}
console.log(equal_pt("paatpss"));
console.log(equal_pt("paatps"));
``````

Live Demo:

See the Pen JavaScript - Check whether a given string contains equal number of p's and t's - basic-ex-55 by w3resource (@w3resource) on CodePen.

What is the difficulty level of this exercise?

﻿

## JavaScript: Tips of the Day

Parameter's value

```function getItems(fruitList, ...args, favoriteFruit) {
return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")
```

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

```function getItems(fruitList, favoriteFruit, ...args) {
return [...fruitList, ...args, favoriteFruit];
}

getItems(['banana', 'apple'], 'pear', 'orange');```
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

Ref: https://bit.ly/3jFRBje