Largest Among Three Numbers

Program to find the largest of three numbers

BeginnerTopic: Conditional Programs

JavaScript Largest Among Three Numbers Program

This program helps you to learn the fundamental structure and syntax of JavaScript programming.

// Method 1: Using if-else
let a = 10, b = 25, c = 15;
let largest;

if (a >= b && a >= c) {
    largest = a;
} else if (b >= a && b >= c) {
    largest = b;
} else {
    largest = c;
}

console.log("Largest among", a + ",", b + ",", c, "is:", largest);

// Method 2: Using Math.max()
let num1 = 10, num2 = 25, num3 = 15;
let max = Math.max(num1, num2, num3);
console.log("Largest using Math.max():", max);

// Method 3: Using function
function findLargest(x, y, z) {
    if (x >= y && x >= z) {
        return x;
    } else if (y >= x && y >= z) {
        return y;
    } else {
        return z;
    }
}

console.log("Largest:", findLargest(5, 8, 3));

// Method 4: Using array and spread operator
function findLargestArray(...numbers) {
    return Math.max(...numbers);
}

console.log("Largest from array:", findLargestArray(10, 25, 15, 30, 5));

Output

Largest among 10 , 25 , 15 is: 25
Largest using Math.max(): 25
Largest: 8
Largest from array: 30

Understanding Largest Among Three Numbers

This program demonstrates multiple approaches to find the largest number.

Method 1: If-Else Chain

Using logical AND (&&) operator:

if (a >= b && a >= c) {
} else if (b >= a && b >= c) {

    // b is largest
} else {

    // c is largest
}

    // a is largest

Logical Operators

•&&: AND - both conditions must be true

•||: OR - at least one condition must be true

•!: NOT - reverses boolean value

Method 2: Math.max()

Built-in JavaScript function:

Math.max(a, b, c);

Pros:

•Simple and concise

•Works with any number of arguments

•Built-in, optimized

Method 3: Function Approach

Reusable function with clear logic:

function findLargest(x, y, z) {
    if (x >= y && x >= z) return x;
    if (y >= x && y >= z) return y;
}

    return z;

Method 4: Spread Operator (ES6)

Using rest parameters:

function findLargestArray(...numbers) {
}

    return Math.max(...numbers);

Spread Operator (`...`)

•Expands array/arguments

•Math.max(...[1, 2, 3]) → Math.max(1, 2, 3)

•Very flexible for multiple values

When to Use:

Math.max()

: Simplest, built-in

If-else

: Learning logic, custom conditions

Function

: Reusable code

Spread

: Variable number of inputs

Let us now understand every line and the components of the above program.

Note: To write and run JavaScript programs, you need to set up the local environment on your computer. Refer to the complete article Setting up JavaScript Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your JavaScript programs.

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