Control flow statements javascript examples geeksforgeeks

Control flow statements javascript examples geeksforgeeks

Here are some examples of control flow statements in JavaScript from GeeksforGeeks:

If-Else Statement

In the following example, we will use an if-else statement to check whether a number is odd or even.

function checkNumber(num) {
if (num % 2 == 0) {
console.log(num + " is even");
} else {
console.log(num + " is odd");
}
}
checkNumber(10); // Output: 10 is even
checkNumber(11); // Output: 11 is odd

Switch-Case Statement

In the following example, we will use a switch-case statement to check the day of the week.

function printDay(day) {
switch (day) {
case "Monday":
console.log("Today is Monday");
break;
case "Tuesday":
console.log("Today is Tuesday");
break;
case "Wednesday":
console.log("Today is Wednesday");
break;
case "Thursday":
console.log("Today is Thursday");
break;
case "Friday":
console.log("Today is Friday");
break;
case "Saturday":
console.log("Today is Saturday");
break;
default:
console.log("Invalid day");
}
}
printDay("Monday"); // Output: Today is Monday
printDay("Sunday");  // Output: Invalid day

For Loop

In the following example, we will use a for loop to iterate through an array of numbers and print their squares.

function squareNumbers(arr) {
for (let i = 0; i < arr.length; i++) {
console.log("The square of " + arr[i] + " is " + Math.pow(arr[i], 2));
}
}
squareNumbers([1, 2, 3]); // Output: The square of 1 is 1
//          The square of 2 is 4
//          The square of 3 is 9

While Loop

In the following example, we will use a while loop to iterate through numbers from 0 to 10 and print them.

function printNumbers() {
let i = 0;
while (i <= 10) {
console.log(i);
i++;
}
}
printNumbers(); // Output: 0
//          1
//          2
//          3
//          ...
//          9
//          10

Do-While Loop

In the following example, we will use a do-while loop to iterate through numbers from 0 to 10 and print them.

function printNumbers() {
let i = 0;
do {
console.log(i);
i++;
} while (i <= 10);
}
printNumbers(); // Output: 0
//          1
//          2
//          3
//          ...
//          9
//          10

Try-Catch-Finally Statement

In the following example, we will use a try-catch-finally statement to catch an error and print it.

function checkDivisor(dividend, divisor) {
try {
if (divisor == 0) {
throw "Cannot divide by zero";
}
console.log("The quotient of " + dividend + "/" + divisor + " is " + (dividend / divisor));
} catch (error) {
console.error(error);
} finally {
console.log("Program execution continues");
}
}
checkDivisor(10, 2); // Output: The quotient of 10/2 is 5
//          Program execution continues
checkDivisor(10, 0);  // Output: Cannot divide by zero
//          Program execution continues

These are some examples of control flow statements in JavaScript. Control flow statements help you control the flow of your program's execution, and they can be used to make decisions, iterate through data structures, handle errors, and more.

Let me know if you have any questions or need further clarification!

What are control statements in JavaScript?

I apologize for the mistake earlier. Here's a detailed explanation of control statements in JavaScript:

Control statements in JavaScript are used to direct the flow of your program, based on certain conditions or criteria. They allow you to make decisions and execute different parts of your code depending on the situation.

There are several types of control statements in JavaScript:

Example:

let age = 25;
if (age >= 18) {
console.log("You're old enough!");
} else {
console.log("You're too young!");
}

Example:

let numbers = [1, 2, 3, 4, 5];
for (let i = 0; i < numbers.length; i++) {
console.log(numbers[i]);
}

Example:

let i = 0;
while (i < 5) {
console.log(i);
if (i === 2) {
break;
}
i++;
}

Example:

function addNumbers(a, b) {
let sum = a + b;
return sum;
}
let result = addNumbers(2, 3);
console.log(result); // Output: 5

In summary, control statements in JavaScript are used to direct the flow of your program, make decisions, and execute different parts of your code depending on conditions or criteria. Understanding how to use these statements effectively is crucial for writing efficient, readable, and maintainable code.

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