JavaScript: Currency math (add, subtract, multiply, division etc.)

JavaScript Math: Exercise-25 with Solution

Currency Math Operations

Write a JavaScript function to do currency math (add, subtract, multiply, divide etc.).

Test Data :
n1 = '$40.24', n2 = '$21.57';

Sample Solution:

JavaScript Code:

// Declare variables 'n1' and 'n2' and assign them string values representing dollar amounts.
var n1 = '$40.24';
var n2 = '$21.57';
// Define a regular expression pattern to match non-numeric characters.
var regp = /[^0-9.-]+/g;

// Remove non-numeric characters from 'n1' and 'n2', convert the resulting strings to floating-point numbers, and perform addition. Output the result to the console.
console.log(parseFloat(n1.replace(regp, '')) + parseFloat(n2.replace(regp, '')));

// Remove non-numeric characters from 'n1' and 'n2', convert the resulting strings to floating-point numbers, and perform subtraction. Output the result to the console.
console.log(parseFloat(n1.replace(regp, '')) - parseFloat(n2.replace(regp, '')));

// Remove non-numeric characters from 'n1' and 'n2', convert the resulting strings to floating-point numbers, and perform multiplication. Output the result to the console.
console.log(parseFloat(n1.replace(regp, '')) * parseFloat(n2.replace(regp, '')));

// Remove non-numeric characters from 'n1' and 'n2', convert the resulting strings to floating-point numbers, and perform division. Output the result to the console.
console.log(parseFloat(n1.replace(regp, '')) / parseFloat(n2.replace(regp, '')));

Output:

61.81
18.67
867.9768
1.865554010199351

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-25 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that performs addition, subtraction, multiplication, and division on currency strings with proper decimal handling.
• Write a JavaScript function that converts currency-formatted strings to numbers, performs arithmetic operations, and returns a formatted currency string.
• Write a JavaScript function that simulates currency math by using integer arithmetic to avoid floating point precision errors.
• Write a JavaScript function that processes currency values, performs calculations, and consistently rounds the result to two decimal places.

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