JavaScript Loops and Jump Statements
Duration : 00:01:00
Loops:
Loops are used to execute a block of code repeatedly as long as a certain condition is met. They help automate repetitive tasks in programming.For Loop:
The 'for' loop is used to iterate over a sequence of numbers or elements. It has three parts: initialization, condition, and iteration.Example:
for (let i = 0; i < 5; i++) {
console.log(i);
} Nested For Loop:
A nested 'for' loop is when one 'for' loop is inside another. This is useful for handling multidimensional arrays or performing tasks with multiple levels of iteration.Example:
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 2; j++) {
console.log(i, j);
}
} While Loop:
A 'while' loop repeatedly executes a block of code as long as a specified condition is true.Example:
let count = 0;
while (count < 3) {
console.log(count);
count++;
} Do…While Statement:
The 'do...while' loop guarantees that the code block will execute at least once, even if the condition is initially false.Example:
let num = 5;
do {
console.log("Number:", num);
num--;
} while (num > 0);
Looping Through Arrays:
Arrays can be looped through using their length and index to access each element.Example:
const fruits = ['apple', 'banana', 'cherry'];
for (let i = 0; i < fruits.length; i++) {
console.log(fruits[i]);
}
Reverse Loop:
A reverse loop iterates through an array in reverse order.Example:
const numbers = [3, 6, 9];
for (let i = numbers.length - 1; i >= 0; i--) {
console.log(numbers[i]);
}
Break Keyword:
The 'break' keyword is used to exit a loop prematurely when a certain condition is met.Example:
for (let i = 0; i < 10; i++) {
if (i === 5) {
break;
}
console.log(i);
}
Still have some questions? Let's discuss.
CONTACT US