Js | loops |
Ranjith srt
Posted on September 3, 2024
Loops
In programming, loops are used to execute a block of code repeatedly until
a specific condition is met or for a specified number of times.
They provide a way to perform repetitive tasks efficiently without writing
the same code multiple times.
Types of Loops
1. For Loop
syntax:
for (initialization; condition; increment)
{
code to be executed
}
Example:
//intiallize condition increment
for ( let i=0; i<5; i++ ){
// 1 // i<=5;
condition ture na mattum ulla irukka block run aagum.
0 0<5 i+0= 0+1=1 t
1 1<5 i+1= 1+1=2 t
4 4<5 i+1= 4+1=5 f loop stop
5 5<5 i+1= 5+1=6 f
index start: 0,1,2,3........
console.log('iteration'${i}')
}
using let - block scoped, not accesssible outside the loop
for ( let i=0; i<5; i++ ){
console.log('iteration'${i}') recommended in program
}
console.log('iteration'${i}')
Let not accesssible outside the loop
using var -function scoped , accesssible outside the loop
for ( var j=0; j<5; j++ ){
console.log('iteration'${j}') not recommended
}
console.log('iteration'${j}')
Var accesssible outside the loop
Looping Backwards:
condition t mattum ..nxt increment block prun aagum.. apram + or - pannum
for ( let i=5; i<0; i-- ){
5=5, 5>0,5-1=4 f 5
4=5, 4>0,5-1=3 t 4
console.log(' reverseiteration'${i}')
}
Nested Loop :
for ( let x=1; x<=2; x++ ){
console.log('outre loop'${x}'); x=1 x=2
y 1 y 1
y 2 y 2
for ( let y=1; x<=3; y++ ){ y 3 y 3
console.log('outre loop'${y}');
}
console.log('iteration'${i}') not accesssible outside the loop
2. While Loop
Syntax:
while (condition)
{
code to be executed
}
Example :
//9 8 7
let balance=10;
console.log(' balance amount brfore while loop'${balance}')
while (balance>0){ 10>0
console.log('rs 1 is spent ,your current balance amount is${balance}')
balance--; //loop reverse 10,9,8,7......
10-1=9,
}
console.log(' balance amount after while loop'${balance}')
//10 20 30
while (balance<50){
20 = 10+10
balance+=10; //incrent=10,20,30......
console.log('rs 10 is spent ,your current balance amount is${balance}')
}
console.log(' balance amount after while loop'${balance}')
3. Do While Loop:
do{
code to be executed
}while (condition);
//10
let num = 0; //condition
do {
console.log('number",${num}'); loop oru vatti kandippa run t f eathu irunthalum aagym.
num++;
} while(num <=5); t
//10<=5 false
output
0
1
2
3
4
5
------
number 10 // oru vatti run agum.
break (stop)
for ( let i=0; i<5; i++ ){
if (i ===3 ){
break; // terminates the loop when i equals 3
}
console.log("iteration{i}");
}
output
iteration 0
iteration 1
iteration 2
continue (skip)
debugger; // use panni paru
for ( let i=0; i<5; i++ ){
if (i ===3 ){ //3 skip pannittu appram continue pannum
continue; // terminates the loop when i equals 3
}
console.log("iteration{i}");
}
output
iteration 0
iteration 1
//3 skip pannittu appram continue pannum
iteration 4
iteration 5
Function in loops:
function greet (number) {
console.log('Hello world $(number)");
}
for (let i = 0; i <10; i++) (
greet(i);
output :
Hello world 0
Hello world 9
💖 💪 🙅 🚩
Ranjith srt
Posted on September 3, 2024
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