JavaScript Program to Subtract Two Numbers

In this article, we will see how to subtract two numbers in JavaScript. A Basic arithmetic operation known as Subtraction involves taking one number (the “subtrahend”) away from another (the “minuend”) in order to calculate their difference. It is denoted by the minus sign (-). A subtraction’s outcome is referred to as the “difference.”

Syntax:

Result = Minuend - Subtrahend

Let’s take two numbers:

Input: a = 10 , b = 20 
Output: 
b - a = 20 - 10 = 10 
a - b = 10 - 20 = -10

Using the Negative Operator ( – ) in Console

We can directly perform Subtraction operations in the console by using the “console.log()” statement by providing two operands that will print the exact difference value.

Example: This example describes the subtraction of two numbers using “console.log”.

Javascript

let a = 10;
let b = 20;

// Subtract directlty
console.log(a - b); // -10
console.log(b - a); // 10

// Subtract by using another variable
let c = b - a;
console.log(c); // 10

// Subtract without any variable
console.log(10 - 20); //-10
console.log(20 - 10); //10
console.log(20 - 10 - 10); //0

Output

-10
10
10
-10
10
0

Using User Defined Functions

Functions in Javascript can be used to calculate the difference between the 2 operands. The function will take parameters as 2 numbers, then the function will return the subtraction of the input parameters. 

Syntax:

function fun_name (param1 , param2) {
    return param1 - param2 ;
}

Example: This example describes the subtraction of 2 numbers using a Function.

Javascript

// First variable
let a = 10;

// Second variable
let b = 20;

// Funciton to subtract two variables
function subtract(a, b) {
    return a - b;
}

// For printing the result
console.log("after subtraction : "
    + subtract(a, b));

Output

after subtraction : -10

Using Arrow Function

The subtraction of two numbers can also be done using the arrow function, where the 2 variables are passed as a parameter of that function and return the value after subtraction

Syntax:

let var_name = (param) => {
    // code
}

Example: This example describes the subtraction of 2 numbers using the Arrow function.

Javascript

// First variable
let a = 10;

// Second variable
let b = 20;

// Arrow funciton for subtraction of  two numbers
let ans = (a, b) => a - b;

// For printing the result in console
console.log("after subtraction : " + ans(a, b));

Output

after subtraction : -10

Using the Subtract Assignment Operator

It subtracts the right operand from the left operand and assigns the result to the left operand. The value provided on the right-hand side will decide how much value it must be decreased.

Syntax:

var_name -= value;

Example: This example describes the subtraction of 2 numbers using the subtraction AND assignment operator.

Javascript

// Create a variable
let a = 20;
let b = 10;

a -= b;

// Print the result
console.log(a); // 10

Output

10