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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>
<head>
<meta charset=utf-8 />
<title>Write a JavaScript function to convert an amount to coins.</title>
</head>
<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:

Flowchart: JavaScript function: Convert an amount to coins

Live Demo:

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


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Next: Write a JavaScript function to compute the value of bn where n is the exponent and b is the bases.

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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