Control Flow Examples in JavaScript

Control flow determines the order in which statements and expressions are executed. Let's look at some real-world examples using if, switch, for, while, and break/continue.

✅ Example 1: Login Access Check

let isLoggedIn = true;

if (isLoggedIn) {
    console.log("Welcome back!");
} else {
    console.log("Please log in.");
}

✅ Example 2: Grade Evaluation

let marks = 85;

if (marks >= 90) {
    console.log("Grade: A");
} else if (marks >= 75) {
    console.log("Grade: B");
} else {
    console.log("Grade: C");
}

✅ Example 3: Day of the Week using Switch

let day = "Saturday";

switch (day) {
    case "Monday":
        console.log("Work day");
        break;
    case "Saturday":
    case "Sunday":
        console.log("Weekend!");
        break;
    default:
        console.log("Just another day");
}

✅ Example 4: Loop with Continue

for (let i = 1; i <= 5; i++) {
    if (i === 3) {
        continue; // Skip 3
    }
    console.log(i);
}

✅ Example 5: Loop with Break

let count = 0;

while (true) {
    count++;
    if (count === 4) {
        break;
    }
    console.log("Counting:", count);
}

🎯 Summary

• Use if/else for binary decisions
• Use switch when checking one value against many
• Use loops for repetition
• Use break to exit early
• Use continue to skip current iteration