# JavaScript: Convert an amount to coins

## JavaScript Function: Exercise-14 with Solution

Write a JavaScript function to convert an amount to coins.

Sample function : amountTocoins(46, [25, 10, 5, 2, 1])
Here 46 is the amount. and 25, 10, 5, 2, 1 are coins.
Output : 25, 10, 10, 1

Sample Solution: -

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset=utf-8 />
<title>Write a JavaScript function to convert an amount to coins.</title>
<body>

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

JavaScript Code:

``````function amountTocoins(amount, coins)
{
if (amount === 0)
{
return [];
}
else
{
if (amount >= coins[0])
{
left = (amount - coins[0]);
return [coins[0]].concat( amountTocoins(left, coins) );
}
else
{
coins.shift();
return amountTocoins(amount, coins);
}
}
}
console.log(amountTocoins(46, [25, 10, 5, 2,1]));
```
```

Sample Output:

```[25,10,10,1]
```

Flowchart:

Live Demo:

See the Pen JavaScript - Convert an amount to coins-function-ex- 14 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

```const string = "foo";
const substring = "oo";

console.log(string.includes(substring));
```

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

```var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);
```

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