Control Structures: Loops

Hello, promising JavaScript coders!

After conditional statements, it’s time to loop into iterating over tasks, another crucial component of programming. We will talk about the for, while, and do-while loops in JavaScript here. These structures are crucial in many coding settings because they allow us to run a section of code numerous times.

Understanding Loops in JavaScript

Loops are used when you want to run the same code repeatedly, each time with a different value or until a particular condition is met. In JavaScript, we have three primary types of loops:

• for Loop: It runs a block of code a specific number of times.

for (initialization; condition; increment/decrement) {
// code to be executed
}

• while Loop: It runs a block of code as long as a specified condition is true.

while (condition) {
// code to be executed
}

• do-while Loop: Similar to the while loop, but this loop will execute the block of code once before checking if the condition is true, then it will repeat the loop as long as the condition is true.

do {
// code to be executed
}
while (condition);

Writing Programs Using Different Loops

• Example using a for loop: Let’s use the for loop to print numbers from 1 to 5.

for (let i = 1; i <= 5; i++) {
console.log(i);
} // Outputs: 1, 2, 3, 4, 5

• Example using a while loop: Let’s use the while loop to print numbers from 1 to 3.

let i = 1;
while (i <= 3) {
console.log(i);
i++;
} // Outputs: 1, 2, 3

• Example using a do-while loop: Printing numbers from 1 to 3.

let i = 1;
do {
console.log(i);
i++;
} while (i <= 3); // Outputs: 1, 2, 3

Exercise

Your task is to create three separate programs:

• Using the for loop, display the multiplication table of 5 up to 10 multiplications.
• With the while loop, print the first five even numbers.
• Employ the do-while loop to prompt the user for a number until they provide a number greater than 100 (use the prompt function for input).

This exercise will provide you with a robust grasp of looping structures in JavaScript.

Conclusion

Congratulations on successfully navigating a loop through another important JavaScript concept! You can efficiently manage repeating activities in your applications if you have a firm grasp of loops.

We’ll explore further as we go along and expand on these principles. Keep your enthusiasm high and keep writing code!