JavaScript: Convert an amount to coins

Last update on May 30 2022 09:59:29 (UTC/GMT +8 hours)

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:

Live Demo:

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

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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